A fifteenth century French triptych in the North Carolina Museum of Art. Bull. N.C. Mus. Art 6(2-3):3-15.

Additional data on the host relations of the parasitic cowbirds. Smithson. Misc. Collect. 149(11):1-12.

The significance of the unimportant in studies of nature and of art. Proc. Am. Philos. Soc. 110:256-260.

A contribution to the ornithology of Uganda. Bull. Los Angeles Cty. Mus. Nat. Hist. Sci. 3:1-55.

1967 Avian symbiosis. In Symbiosis, vol. 2, ed. S. Mark Henry, pp. 291-316. New York: Academic Press.

Evolutionary terms for parasitic species. Syst. Zool. 16:175.

With K. E. Stager. Results of the 1966 Cheney expedition to the Samburu District, Kenya. Ornithology. Los Angeles Cty. Mus. Nat. Hist. Contrib. Sci. 130:1-34.

Alloxenia in three sympatric African species of Cuculus. Proc. U.S. Nat. Mus. 124:1-14.

With S. Keith and A. Twomey. A new subspecies of Apalis rufogularis (Fraser) from Uganda. Bull. Brit. Ornithol. Club 87:165-66.

1968 Additional data on brood parasitism in the honey-guides. Proc. U.S. Nat. Mus. 124(3648):1-8.

Parallel evolution in the small species of Indicator (Aves). Proc. U.S. Nat. Mus. 125(3655):1-10.

With J. G. Williams. Notable records of rare or little-known birds from western Uganda. Rev. Zool. Bot. Afr. 77(1-2):11-36.

The evolutionary history of the avian genus Chrysococcyx. U.S. Nat. Mus. Bull. 265:1-137.

Range and variation of the icterine bulbul in Uganda. Bull. Brit. Ornithol. Club 88:110-112.

With S. Keith. First specimen of Otus scops turanicus (London) from Africa. Bull. Brit. Ornithol. Club 88:112.

1980 A Bestiary for Saint Jerome. Animal Symbolism in European Religious Art. Washington, D.C.: Smithsonian Institution Press.