APA সাইটেশন

Welker, R. H. (1966). BIRDS and MEN: American Birds in science, art literature, and conservation, 1800 - 1900. New York: Originally published by Harvard University press.

শিকাগো স্টাইলে সাইটেশন

Welker, Robert Henry. BIRDS and MEN: American Birds in Science, Art Literature, and Conservation, 1800 - 1900. New York: Originally published by Harvard University press, 1966.

এমএলএ সাইটেশন

Welker, Robert Henry. BIRDS and MEN: American Birds in Science, Art Literature, and Conservation, 1800 - 1900. New York: Originally published by Harvard University press, 1966.