APA (7th ed.) Citation

International Ornithological Congress Amsterdam & Beaufort, L. F. d. (1931). Proceedings of the VIIth International Ornithological Congress: At Amsterdam 1930.

Chicago Style (17th ed.) Citation

International Ornithological Congress Amsterdam and Lieven F. de Beaufort. Proceedings of the VIIth International Ornithological Congress: At Amsterdam 1930. Amsterdam, 1931.

MLA (9th ed.) Citation

International Ornithological Congress Amsterdam and Lieven F. de Beaufort. Proceedings of the VIIth International Ornithological Congress: At Amsterdam 1930. 1931.