Cita APA

Day, R. W., & Day, R. W. (2001). Soil testing manual: Procedures, classification data, and sampling practices. New York: McGraw-Hill.

Citación estilo Chicago

Day, Robert W., y Robert W. Day. Soil Testing Manual: Procedures, Classification Data, and Sampling Practices. New York: McGraw-Hill, 2001.

Cita MLA

Day, Robert W., y Robert W. Day. Soil Testing Manual: Procedures, Classification Data, and Sampling Practices. New York: McGraw-Hill, 2001.