APA (7th ed.) Citation

Gould, C. N., & Lewis, F. E. (1926). The Permian of western Oklahoma and the Panhandle of Texas. [publisher not identified].

Chicago Style (17th ed.) Citation

Gould, Charles Newton, and Frank E. Lewis. The Permian of Western Oklahoma and the Panhandle of Texas. Norman: [publisher not identified], 1926.

MLA (9th ed.) Citation

Gould, Charles Newton, and Frank E. Lewis. The Permian of Western Oklahoma and the Panhandle of Texas. [publisher not identified], 1926.