Παραπομπή APA

Eicher, D. L. (1976). Geologic time (2.). Prentice - Hall.

Παραπομπή Chicago Style

Eicher, Don L. Geologic Time. 2. New Jersey: Prentice - Hall, 1976.

Παραπομπή MLA

Eicher, Don L. Geologic Time. 2. Prentice - Hall, 1976.