Cita APA (7a ed.)
Vierich, H. I. D., & Stoop, W. A. (1990). Changes in West African Savanna agriculture in response to growing population and continuing low rainfall. Elsevier.
Cita Chicago Style (17a ed.)
Vierich, H. I. D., y Willem A. Stoop. Changes in West African Savanna Agriculture in Response to Growing Population and Continuing Low Rainfall. Elsevier, 1990.
Cita MLA (9a ed.)
Vierich, H. I. D., y Willem A. Stoop. Changes in West African Savanna Agriculture in Response to Growing Population and Continuing Low Rainfall. Elsevier, 1990.
Precaución: Estas citas no son 100% exactas.