Cita APA (7a ed.)
Ehui, S. K., & Polson, R. (1993). A review of the economic and ecological constraints on animal draft cultivation in sub-Saharan Africa. Elsevier.
Cita Chicago Style (17a ed.)
Ehui, Simeon K., y R. Polson. A Review of the Economic and Ecological Constraints on Animal Draft Cultivation in Sub-Saharan Africa. Elsevier, 1993.
Cita MLA (9a ed.)
Ehui, Simeon K., y R. Polson. A Review of the Economic and Ecological Constraints on Animal Draft Cultivation in Sub-Saharan Africa. Elsevier, 1993.
Precaución: Estas citas no son 100% exactas.