APA-referens (7:e uppl.)

Wicander, R. (2021). Geology: Earth in perspective (Third edition.). Cengage Learning, Inc.

Chicago-referens (17:e uppl.)

Wicander, Reed. Geology: Earth in Perspective. Third edition. Boston: Cengage Learning, Inc, 2021.

MLA-referens (9:e uppl.)

Wicander, Reed. Geology: Earth in Perspective. Third edition. Cengage Learning, Inc, 2021.