Cita APA (7a ed.)
Nkonya, E. M., Barkley, A. P., Hamilton, S. F., & Bernardo, D. J. (1999). Environmental and economic impacts of soil erosion and fertility mining in northern Tanzania. Agricultural and Applied Economics Association.
Cita Chicago Style (17a ed.)
Nkonya, Ephraim M., Andrew P. Barkley, Stephen F. Hamilton, y Daniel J. Bernardo. Environmental and Economic Impacts of Soil Erosion and Fertility Mining in Northern Tanzania. Agricultural and Applied Economics Association, 1999.
Cita MLA (9a ed.)
Nkonya, Ephraim M., et al. Environmental and Economic Impacts of Soil Erosion and Fertility Mining in Northern Tanzania. Agricultural and Applied Economics Association, 1999.
Precaución: Estas citas no son 100% exactas.