APA (7th ed.) Citation

Ahr, W. M. (1983). A field trip to the Austin Chalk: South Central Section GSA, March 1983. [W. Ahr].

Chicago Style (17th ed.) Citation

Ahr, Wayne M. A Field Trip to the Austin Chalk: South Central Section GSA, March 1983. [College Station, Tex.]: [W. Ahr], 1983.

MLA (9th ed.) Citation

Ahr, Wayne M. A Field Trip to the Austin Chalk: South Central Section GSA, March 1983. [W. Ahr], 1983.