APA (7th ed.) Citation

Swartz, F. M. (1929). The Helderberg group of parts of West Virginia and Virginia. U.S. Govt. Print. Off.

Chicago Style (17th ed.) Citation

Swartz, Frank M. The Helderberg Group of Parts of West Virginia and Virginia. Washington: U.S. Govt. Print. Off, 1929.

MLA (9th ed.) Citation

Swartz, Frank M. The Helderberg Group of Parts of West Virginia and Virginia. U.S. Govt. Print. Off, 1929.