Cita APA (7a ed.)
Shapiro, B. I., & Sanders, J. (1998). Fertilizer use in semiarid West Africa: Profitability and supporting policy. Elsevier.
Cita Chicago Style (17a ed.)
Shapiro, Barry I., y J.H Sanders. Fertilizer Use in Semiarid West Africa: Profitability and Supporting Policy. Elsevier, 1998.
Cita MLA (9a ed.)
Shapiro, Barry I., y J.H Sanders. Fertilizer Use in Semiarid West Africa: Profitability and Supporting Policy. Elsevier, 1998.
Precaución: Estas citas no son 100% exactas.