Cita APA

Boul, S., Southard, R., Graham, R., & McDaniel, P. (2003). Soil genesis and classification (5th. ed.). Ames, Iowa: Blackwell.

Citación estilo Chicago

Boul, S.W., R.J Southard, R.C Graham, and P.A McDaniel. Soil Genesis and Classification. 5th. ed. Ames, Iowa: Blackwell, 2003.

Cita MLA

Boul, S.W., R.J Southard, R.C Graham, and P.A McDaniel. Soil Genesis and Classification. 5th. ed. Ames, Iowa: Blackwell, 2003.