APA

International Ornithological Congress, Voous K. H., . (1972). Proceedings of the XV international ornithological congress. Leiden: E. J. Brill.

Chicago

International Ornithological Congress, Voous K H, . 1972. Proceedings of the XV international ornithological congress. Leiden: E. J. Brill.

Harvard

International Ornithological Congress, Voous K. H., . (1972). Proceedings of the XV international ornithological congress. Leiden: E. J. Brill.

MLA

International Ornithological Congress, Voous K H, . Proceedings of the XV international ornithological congress. Leiden: E. J. Brill. 1972.