APA (7th ed.) Citation

Arkansas Geological Survey, 1907-1923, Purdue, A. H., & Branner, J. C. (1909). The slates of Arkansas. [publisher not identified].

Chicago Style (17th ed.) Citation

Arkansas Geological Survey, 1907-1923, A. H. Purdue, and John Casper Branner. The Slates of Arkansas. [Little Rock, Ark.]: [publisher not identified], 1909.

MLA (9th ed.) Citation

Arkansas Geological Survey, 1907-1923, et al. The Slates of Arkansas. [publisher not identified], 1909.