Smithsonian Institution. (1937). Life histories of North American birds of prey, Part 1, order Falconiformes. [s.n.].
Chicago Style (17th ed.) CitationSmithsonian Institution. Life Histories of North American Birds of Prey, Part 1, Order Falconiformes. [Washington]: [s.n.], 1937.
MLA (9th ed.) CitationSmithsonian Institution. Life Histories of North American Birds of Prey, Part 1, Order Falconiformes. [s.n.], 1937.
Warning: These citations may not always be 100% accurate.