Παραπομπή APA

Dunbar, C. O., & Rodgers, J. Principles of stratigraphy.

Παραπομπή Chicago Style

Dunbar, Carl O., και John Rodgers. Principles of Stratigraphy.

Παραπομπή MLA

Dunbar, Carl O., και John Rodgers. Principles of Stratigraphy.