Dyfyniad APA
Abbott, J., Makeham, J. P., & Payne, W. J. A. (1979). Agricultural economics and marketing in the tropics. Longman.
Dyfyniad Arddull Chicago
Abbott, J.C, J. P. Makeham, and W. J. A. Payne. Agricultural Economics and Marketing in the Tropics. London: Longman, 1979.
Dyfyniad MLA
Abbott, J.C, et al. Agricultural Economics and Marketing in the Tropics. Longman, 1979.
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