APA (7th ed.) Citation
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.
Chicago Style (17th ed.) Citation
Spain, James M., C.A Francis, Reinhardt H. Howeler, and FA Calvo. Differential Species and Varietal Tolerance to Soil Acidity in Tropical Crops and Pastures. North Carolina State University, 1975.
MLA (9th ed.) Citation
Spain, James M., et al. Differential Species and Varietal Tolerance to Soil Acidity in Tropical Crops and Pastures. North Carolina State University, 1975.
Warning: These citations may not always be 100% accurate.