APA (7th ed.) Citation

Ritch, H. J. (1958). A study of water driven oil encroachment into gas caps. [publisher not identified].

Chicago Style (17th ed.) Citation

Ritch, Harlan J. A Study of Water Driven Oil Encroachment into Gas Caps. [College Station, Tex.]: [publisher not identified], 1958.

MLA (9th ed.) Citation

Ritch, Harlan J. A Study of Water Driven Oil Encroachment into Gas Caps. [publisher not identified], 1958.