APA (7th ed.) Citation

Nelson, R. J. (2010). Photoperiodism: The biological calendar. Oxford Univ. Press.

Chicago Style (17th ed.) Citation

Nelson, Randy Joe. Photoperiodism: The Biological Calendar. Oxford [u.a.]: Oxford Univ. Press, 2010.

MLA (9th ed.) Citation

Nelson, Randy Joe. Photoperiodism: The Biological Calendar. Oxford Univ. Press, 2010.

Warning: These citations may not always be 100% accurate.