APA-viite

Longwell, C. R., & Flint, R. F. Introduction to physical geology (6th ed.).

Chicago-tyylinen lähdeviittaus

Longwell, Chester R., ja Richard F. Flint. Introduction to Physical Geology. 6th ed.

MLA-viite

Longwell, Chester R., ja Richard F. Flint. Introduction to Physical Geology. 6th ed.