APA استشهاد

Forster, G., & Leager, M. C. Elements of agricultural economic. Prentice hall INC.

استشهاد بنمط شيكاغو

Forster, G.W, و Marc C. Leager. Elements of Agricultural Economic. New York: Prentice hall INC.

MLA استشهاد

Forster, G.W, و Marc C. Leager. Elements of Agricultural Economic. Prentice hall INC.