Cita APA (7a ed.)
Spielman, D. J., Mekonnen, D. K., & Alemu, D. (2012). Seed, fertilizer, and agricultural extension in Ethiopia. University of Pennsylvania Press.
Cita Chicago Style (17a ed.)
Spielman, David J., Dawit Kelemework Mekonnen, y Dawit Alemu. Seed, Fertilizer, and Agricultural Extension in Ethiopia. University of Pennsylvania Press, 2012.
Cita MLA (9a ed.)
Spielman, David J., et al. Seed, Fertilizer, and Agricultural Extension in Ethiopia. University of Pennsylvania Press, 2012.
Precaución: Estas citas no son 100% exactas.