APA (7th ed.) Citation

Schrab, G., & Boszhardt, R. F. (2016). Hidden thunder: Rock art of the upper midwest (E-book edition.). Wisconsin Historical Society Press.

Chicago Style (17th ed.) Citation

Schrab, Geri, and Robert F. Boszhardt. Hidden Thunder: Rock Art of the Upper Midwest. E-book edition. Madison, WI: Wisconsin Historical Society Press, 2016.

MLA (8th ed.) Citation

Schrab, Geri, and Robert F. Boszhardt. Hidden Thunder: Rock Art of the Upper Midwest. E-book edition. Wisconsin Historical Society Press, 2016.