APA (7th ed.) Citation

Piper, L. D. (1981). Criteria for displacement by gas versus water in oil reservoirs. [publisher not identified].

Chicago Style (17th ed.) Citation

Piper, Larry Dean. Criteria for Displacement by Gas Versus Water in Oil Reservoirs. [Place of publication not identified]: [publisher not identified], 1981.

MLA (9th ed.) Citation

Piper, Larry Dean. Criteria for Displacement by Gas Versus Water in Oil Reservoirs. [publisher not identified], 1981.