APA (7th ed.) Citation

Croneis, C., & Blacklock, C. M. (1930). Map showing structural axes of the Arkansas Valley and Ozark provinces. Arkansas Geological Survey.

Chicago Style (17th ed.) Citation

Croneis, Carey, and Carl M. Blacklock. Map Showing Structural Axes of the Arkansas Valley and Ozark Provinces. [Little Rock?]: Arkansas Geological Survey, 1930.

MLA (9th ed.) Citation

Croneis, Carey, and Carl M. Blacklock. Map Showing Structural Axes of the Arkansas Valley and Ozark Provinces. Arkansas Geological Survey, 1930.