APA (7th ed.) Citation

Plank, M. O., & Schenck, W. S. (1998). Delaware Piedmont geology: Including a guide to the rocks of Red Clay Valley. Delaware Geological Survey, University of Delaware.

Chicago Style (17th ed.) Citation

Plank, Margaret O., and William S. Schenck. Delaware Piedmont Geology: Including a Guide to the Rocks of Red Clay Valley. [Newark, Del.]: Delaware Geological Survey, University of Delaware, 1998.

MLA (9th ed.) Citation

Plank, Margaret O., and William S. Schenck. Delaware Piedmont Geology: Including a Guide to the Rocks of Red Clay Valley. Delaware Geological Survey, University of Delaware, 1998.