Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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