APA (7th ed.) Citation

New York. Public library. (1941). A Guide to the references collections of the New York Public Library. The New York Public Library.

Chicago Style (17th ed.) Citation

New York. Public library. A Guide to the References Collections of the New York Public Library. New York: The New York Public Library, 1941.

MLA (9th ed.) Citation

New York. Public library. A Guide to the References Collections of the New York Public Library. The New York Public Library, 1941.