Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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

Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.