Cita APA (7a ed.)

Ballard, C. (2005). How we use soil. Raintree.

Cita Chicago Style (17a ed.)

Ballard, Carol. How We Use Soil. Chicago: Raintree, 2005.

Cita MLA (9a ed.)

Ballard, Carol. How We Use Soil. Raintree, 2005.