Cita APA (7th ed.)

Hefferan, K., & O'Brien, J. (2010). Earth materials. Wiley-Blackwell.

Cita Chicago (17th ed.)

Hefferan, Kevin, i John O'Brien. Earth Materials. Chichester, West Sussex, Eng: Wiley-Blackwell, 2010.

Cita MLA (9th ed.)

Hefferan, Kevin, i John O'Brien. Earth Materials. Wiley-Blackwell, 2010.