Παραπομπή APA

Weller, J. M. (1960). Stratigraphic principles and practice. Universal.

Παραπομπή Chicago Style

Weller, J. Marvin. Stratigraphic Principles and Practice. New Delhi: Universal, 1960.

Παραπομπή MLA

Weller, J. Marvin. Stratigraphic Principles and Practice. Universal, 1960.