APA (7th ed.) Citation

Twiss, P. C. (1959). Geology of Van Horn Mountains, Trans-Pecos Texas. [publisher not identified].

Chicago Style (17th ed.) Citation

Twiss, Page C. Geology of Van Horn Mountains, Trans-Pecos Texas. [Place of publication not identified]: [publisher not identified], 1959.

MLA (8th ed.) Citation

Twiss, Page C. Geology of Van Horn Mountains, Trans-Pecos Texas. [publisher not identified], 1959.