Benson, C.W. and Winterbottom, J.M. 1968. The relationships of the Striped Crake Crecopsis egregia (Peters) and the White-throated Crake Porzana albicollis (Vieillot). Ostrich 39: 177-179.
Blaker, D. and Winterbottom, J.M. 1968. Bird counts at Strandfontein sewage works and Riet Vlei, Cape Town. Ostrich 39: 94-104.
Broekhuysen, G.J., Siegfried, W.R. and Low, D. 1968. Bar-tailed Godwit at Bredasdorp. Ostrich 39: 39.
Broekhuysen, G.J. and Winterbottom, J.M. 1968. Breeding activities of the Cape White-eye Zosterops virens capensis Sundevall in the south-west Cape. Ostrich 39: 163-176.
Clancey, P.A. and Winterbottom, J.M. 1968. Comment on the proposed suppression of Strix capensis Daudin, 1800. Z.N.(S.) 1692. Bulletin of Zoological Nomenclature 25: 3.
Hartley, A., Tongue, P., Van Zinderen Bakker, E.M. Jnr, Winterbottom, J.M. and Winterbottom, M.G. 1968. Breeding of Glossy Ibis on Berg River, Cape Province. Ostrich 39: 39-40.
Payne, R.B. 1968. A preliminary report on the relationships of the indigobirds. Bulletin of the British Ornithologists' Club 88: 32-36.
Quinton, W.F. and Winterbottom, J.M. 1968. A list of the birds of the Beaufort West District. South African Avifauna Series 55: 1-18.
Rowan, M.K. 1968. The origins of European Swallows "wintering" in South Africa. Ostrich 39: 76-84.
Siegfried, W.R. 1968. Little Swift Apus affinis breeding at Stellenbosch. Ostrich 39: 39.
Siegfried, W.R. 1968. The Black Duck in the south-western Cape. Ostrich 39: 61-75.
Siegfried, W.R. 1968. Non-breeding plumage in the adult male Maccoa Duck. Ostrich 39: 91-93.
Siegfried, W.R. 1968. Ecological composition of the avifaunal community in a Stellenbosch suburb. Ostrich 39: 105-129.
Siegfried, W.R. 1968. Breeding season, clutch and brood sizes in Verreaux's Eagle. Ostrich 39: 139-145.
Siegfried, W.R. 1968. Temperature variation in the Cattle Egret. Ostrich 39: 150-154.
Siegfried, W.R. 1968. Steppe Buzzards feeding on caterpillars in vineyards. Ostrich 39: 155.
Siegfried, W.R. 1968. Roadside counts of raptorial birds in the sandveld area of the south-western Cape. Ostrich 39: 195-196.
Siegfried, W.R. 1968. The reactions of certain birds to rodent baits treated with zinc phosphide. Ostrich 39: 197-198.
Siegfried, W.R. 1968. American Purple Gallinule at Stellenbosch. Ostrich 39: 199.
Siegfried, W.R. 1968. Note on repeat-breeding in the Karoo Prinia. Ostrich 39: 199.
Siegfried, W.R. 1968. Spoonbills breeding at Stellenbosch. Ostrich 39: 199.
Siegfried, W.R. 1968. Relative abundance of birds of prey in the Cape Province. Ostrich 39: 253-258.
Siegfried, W.R. 1968. Review: Waterfowl - their biology and natural history (Johnsgard). Ostrich 39: 272-273.
Siegfried, W.R. 1968. The birds of Jonkershoek, Stellenbosch. South African Avifauna Series 54: 1-19.
Siegfried, W.R., Broekhuysen, G.J. and LOW, D. 1968. African Cuckoo at Bredasdorp. Ostrich 39: 38-39.
Siegfried, W.R. and Winterbottom, J.M. 1968. Additions to the list of birds of the De Hoop region, Bredasdorp, Cape. Ostrich 39: 38.
Winterbottom, J.M. 1968. Layard, Edgar Leopold. In: De Kock, W.J. (Ed.), Dictionary of South African biography 1: 467-468.
Winterbottom, J.M. 1968. A check list of the land and fresh water birds of the western Cape Province. Annals of the South African Museum 53: 1-275.
Winterbottom, J.M. 1968. Bibliography of the birds of the western Cape to 31 December 1964. Annals of the South African Museum 53: 277-285.
Winterbottom, J.M. 1968. Remarks on the possible origin of the avifauna of the south west Cape. Ibis 110: 91-93.
Winterbottom, J.M. 1968. Bird density in coastal renosterbosveld of the Bontebok National Park. Koedoe 11: 139-144.
Winterbottom, J.M. 1968. Index to the Ostrich, vol, XXXVIII, 18 pp.
Winterbottom, J.M. 1968. Systematic notes on birds of the Cape Province. XXX. The type-locality of Bucco leucomelas Boddaert, 1783. Ostrich 39: 38.
Winterbottom, J.M. 1968. The avifaunas of three agricultural habitats in the south-western Cape. Ostrich 39: 51-60.
Winterbottom, J.M. 1968. The bird population of karoid broken veld in the Klaarstroom area, Princ Albert Division. Ostrich 39: 85-90.
Winterbottom, J.M. 1968. The avifaunas of three fresh water habitats in the south-west Cape. Ostrich 39: 130-138.
Winterbottom, J.M. 1968. Remarks on some forest avifaunas of southern Africa, with special reference to the south west Cape. Ostrich 39: 146-149.
Winterbottom, J.M. 1968. Note on the affinities of the avifauna of the Nile sudd area. Ostrich 39: 155.
Winterbottom, J.M. 1968. Note on the avifauna of streamside vegetation in the south-west Cape Province. Ostrich 39: 155-156.
Winterbottom, J.M. 1968. White-backed Duck at Gross Barmen. Ostrich 39: 156.
Winterbottom, J.M. 1968. Note on the birds of Karoo dams and vleis in the Western Cape. Ostrich 39: 157-158.
Winterbottom, J.M. 1968. The south western form of Lybius leucomelas (Boddaert). Ostrich 39: 158.
Winterbottom, J.M. 1968. Review: Pigeons and doves of the world (Goodwin). Ostrich 39: 206.
Winterbottom, J.M. 1968. Review: Bird navigation, ed. 2 (Matthews). Ostrich 39: 273-274.
Winterbottom, J.M. 1968. Remarks on the avifauna of the macchia of the southern Cape Province. Revue de Zoologie et de Botanique Africaines 77: 221-235.
Winterbottom, J.M. 1968. A list of the birds of Tulbagh District. South African Avifauna Series 59: 1-10.
Winterbottom, J.M. 1968. Additions to the Cape and Orange Free State lists in the South African Avifauna Series. South African Avifauna Series 60: 1-9.