Dyfyniad APA

Walther, J. V. (2009). Essentials of geochemistry (2nd ed.). Jones & Bartlett Publishers.

Dyfyniad Arddull Chicago

Walther, John V. Essentials of Geochemistry. 2nd ed. Sudbury, Mass: Jones & Bartlett Publishers, 2009.

Dyfyniad MLA

Walther, John V. Essentials of Geochemistry. 2nd ed. Jones & Bartlett Publishers, 2009.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.