APA-referens (7:e uppl.)

Billings, M. (2019). Structural Geology (8th.). Pearson.

Chicago-referens (17:e uppl.)

Billings, Marland. Structural Geology. 8th. New Delhi: Pearson, 2019.

MLA-referens (9:e uppl.)

Billings, Marland. Structural Geology. 8th. Pearson, 2019.