Παραπομπή APA

Hedberg, H. D. (1976). International stratigraphic guide: A guide to stratigraphic classification, terminology, and procedure. New York: Wiley.

Παραπομπή Chicago Style

Hedberg, Hollis Dow. International Stratigraphic Guide: A Guide to Stratigraphic Classification, Terminology, and Procedure. New York: Wiley, 1976.

Παραπομπή MLA

Hedberg, Hollis Dow. International Stratigraphic Guide: A Guide to Stratigraphic Classification, Terminology, and Procedure. New York: Wiley, 1976.

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