APA استشهاد

John, K. a. (1997). Farmers participation in agricultural research and extention systems. Concept publishing.

استشهاد بنمط شيكاغو

John, K.C...[et. al.]. Farmers Participation in Agricultural Research and Extention Systems. New Delhi: Concept publishing, 1997.

MLA استشهاد

John, K.C...[et. al.]. Farmers Participation in Agricultural Research and Extention Systems. Concept publishing, 1997.