Παραπομπή APA

Mears, B. (1978). Essentials of geology. D van nostrand company.

Παραπομπή Chicago Style

Mears, B. Essentials of Geology. NewYork: D van nostrand company, 1978.

Παραπομπή MLA

Mears, B. Essentials of Geology. D van nostrand company, 1978.