APA استشهاد

Fehr, W. (1987). Principles of cultivar development V.1: Theory and technique. Macmillan Company.

استشهاد بنمط شيكاغو

Fehr, W.R. Principles of Cultivar Development V.1: Theory and Technique. New York: Macmillan Company, 1987.

MLA استشهاد

Fehr, W.R. Principles of Cultivar Development V.1: Theory and Technique. Macmillan Company, 1987.