United States. Agency for International Development. (1973). Agronomic- economic research on tropical soils. North Carolina State University. Soil Science Department.
Cita Chicago Style (17a ed.)United States. Agency for International Development. Agronomic- Economic Research on Tropical Soils. Raleigh: North Carolina State University. Soil Science Department, 1973.
Cita MLA (8a ed.)United States. Agency for International Development. Agronomic- Economic Research on Tropical Soils. North Carolina State University. Soil Science Department, 1973.
Precaución: Estas citas no son 100% exactas.