Gaya APA

TROEH, F, R, H, J, A, D, R, L. (2004). Soil and water conservation for productivity and environmental protection. Fourth edition . : Pearson education. Prentice Hall.

Gaya MLA

TROEH, Frederick, R,;, HOBB,, J., Athur;, DONAHUE,, Roy, L.. "Soil and water conservation for productivity and environmental protection. Fourth edition". : Pearson education. Prentice Hall, 2004. Buku.