APA استشهاد

Cramer,GaiI L, & Gensen,Clarence W. (1979). Agricultural economics and agribusiness (4.). John Wiley.

استشهاد بنمط شيكاغو

Cramer,GaiI L, و Gensen,Clarence W. Agricultural Economics and Agribusiness. 4. New York: John Wiley, 1979.

MLA استشهاد

Cramer,GaiI L, و Gensen,Clarence W. Agricultural Economics and Agribusiness. 4. John Wiley, 1979.