APA ציטוט

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

Chicago Edition Citation

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

ציטוט MLA

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