APA (7th ed.) Citation

Tapper, W., & Greer, W. J. (1950). New system of electric logging. World Oil, 131, 119.

Chicago Style (17th ed.) Citation

Tapper, W., and W. J. Greer. "New System of Electric Logging." World Oil 131 (1950): 119.

MLA (9th ed.) Citation

Tapper, W., and W. J. Greer. "New System of Electric Logging." World Oil, vol. 131, 1950, p. 119.