APA-referens (7:e uppl.)

Stephen, W. P. (1972). Studies in crop pollination. O.E.A.

Chicago-referens (17:e uppl.)

Stephen, W. P. Studies in Crop Pollination. Washington, D.C, USA: O.E.A, 1972.

MLA-referens (9:e uppl.)

Stephen, W. P. Studies in Crop Pollination. O.E.A, 1972.