Cita APA

Harper, R. M., & Jones, W. B. (1940). Statistics of mineral production in Alabama, 1926 to 1938. Geological Survey of Alabama.

Citación estilo Chicago

Harper, Roland M., and Walter B. Jones. Statistics of Mineral Production in Alabama, 1926 to 1938. University, Ala.: Geological Survey of Alabama, 1940.

Cita MLA

Harper, Roland M., and Walter B. Jones. Statistics of Mineral Production in Alabama, 1926 to 1938. Geological Survey of Alabama, 1940.