APA استشهاد

Foster, P. W. (1967). Research on agricultural development in North-Africa. New york.

استشهاد بنمط شيكاغو

Foster, Philip W. Research on Agricultural Development in North-Africa. Agricultural development council,inc: New york, 1967.

MLA استشهاد

Foster, Philip W. Research on Agricultural Development in North-Africa. New york, 1967.