APA (7th ed.) Citation

Gregg, J. E. (1933). The history of Presidio County. [publisher not identified].

Chicago Style (17th ed.) Citation

Gregg, John Ernest. The History of Presidio County. [Place of publication not identified]: [publisher not identified], 1933.

MLA (9th ed.) Citation

Gregg, John Ernest. The History of Presidio County. [publisher not identified], 1933.