APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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