Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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