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TiNBERGEN, NiKOLAAS 



1951. The study of instinct, Oxford, Univ. Press, 228 pp., 130 figs. 



1953. Social behaviour in animals . . . , London, Methuen, 150 pp., 8 



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1935. African finches. Aviculture, ser. 3, vol. 5., No. 4, pp. 40-41. 



ToRDOFF, Harrison B. 



1954. A systematic study of the avian family Fringillidae based on the 



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VAN Someren, Victor Gurnet Logan 



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 1939. Reports on the Coryndon Museum expedition to the Chyulu Hills. 



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VAN Someren, Victor Gurnet Logan, and van Someren, G. R. C. 



1945. Evacuated weaver colonies and notes on the breeding ecology of 



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87, pp. 33-44. 

 1949. The birds of Bwamba. Uganda Journ., vol. 13, special supp. Ill pp., 



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Vaughan, John Henry 



1930. The birds of Zanzibar and Pemba, II. Ibis, ser 12, vol. 6, pp. 1-48, 

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Verheyen, Rene 



1947a. Notessurlafauneornitholigiquedel'Afriquecentrale. VIII. Releve 



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