Wentworth, C. M. The Upper Cretaceous and Lower Tertiary rocks of the Gualala area, northern Coast Ranges, California. University Microfilms.
Chicago-referens (17:e uppl.)Wentworth, Carl Merrick. The Upper Cretaceous and Lower Tertiary Rocks of the Gualala Area, Northern Coast Ranges, California. Ann Arbor, Mich: University Microfilms.
MLA-referens (9:e uppl.)Wentworth, Carl Merrick. The Upper Cretaceous and Lower Tertiary Rocks of the Gualala Area, Northern Coast Ranges, California. University Microfilms.
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