APA (7th ed.) Citation

Norris, R. A. (1958). Comparative biosystematics and life history of the nuthatches Sitta pygmaea and Sitta pusilla. University of California Press.

Chicago Style (17th ed.) Citation

Norris, Robert Allen. Comparative Biosystematics and Life History of the Nuthatches Sitta Pygmaea and Sitta Pusilla. Berkeley: University of California Press, 1958.

MLA (9th ed.) Citation

Norris, Robert Allen. Comparative Biosystematics and Life History of the Nuthatches Sitta Pygmaea and Sitta Pusilla. University of California Press, 1958.