APA (7th ed.) Citation

Heck, W. A. (1952). Boundary of the Pennsylvanian and Permain (?) in the subsurface Scurry Reef, Scurry County, Texas. [publisher not identified].

Chicago Style (17th ed.) Citation

Heck, W. A. Boundary of the Pennsylvanian and Permain (?) in the Subsurface Scurry Reef, Scurry County, Texas. Austin: [publisher not identified], 1952.

MLA (9th ed.) Citation

Heck, W. A. Boundary of the Pennsylvanian and Permain (?) in the Subsurface Scurry Reef, Scurry County, Texas. [publisher not identified], 1952.