Dyfyniad APA

Hudson,Travis. (2011). Living with earth: An introduction to environmental geology. Pearson education.

Dyfyniad Arddull Chicago

Hudson,Travis. Living with Earth: An Introduction to Environmental Geology. Boston: Pearson education, 2011.

Dyfyniad MLA

Hudson,Travis. Living with Earth: An Introduction to Environmental Geology. Pearson education, 2011.

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