APA (7th ed.) Citation

Gruy, H. J. (1956). A critical review of methods used in the estimation of natural gas reserves. [publisher not identified].

Chicago Style (17th ed.) Citation

Gruy, Henry Jones. A Critical Review of Methods Used in the Estimation of Natural Gas Reserves. [College Station, Tex.]: [publisher not identified], 1956.

MLA (9th ed.) Citation

Gruy, Henry Jones. A Critical Review of Methods Used in the Estimation of Natural Gas Reserves. [publisher not identified], 1956.