APA استشهاد

Abbott, J., & Makeham, J. (1979). Agricultural economics and marketing in the tropics. Longman.

استشهاد بنمط شيكاغو

Abbott, J.C, و J.P Makeham. Agricultural Economics and Marketing in the Tropics. London: Longman, 1979.

MLA استشهاد

Abbott, J.C, و J.P Makeham. Agricultural Economics and Marketing in the Tropics. Longman, 1979.