Cita APA (7a ed.)
Spain, J. M., Francis, C., Howeler, R. H., & Calvo, F. (1975). Differential species and varietal tolerance to soil acidity in tropical crops and pastures. North Carolina State University.
Cita Chicago Style (17a ed.)
Spain, James M., C.A Francis, Reinhardt H. Howeler, y FA Calvo. Differential Species and Varietal Tolerance to Soil Acidity in Tropical Crops and Pastures. North Carolina State University, 1975.
Cita MLA (9a ed.)
Spain, James M., et al. Differential Species and Varietal Tolerance to Soil Acidity in Tropical Crops and Pastures. North Carolina State University, 1975.
Precaución: Estas citas no son 100% exactas.