APA (7th ed.) Citation

Helton, W. L. (1964). Kentucky's rocks and minerals. University of Kentucky.

Chicago Style (17th ed.) Citation

Helton, Walter Lee. Kentucky's Rocks and Minerals. [Lexington]: University of Kentucky, 1964.

MLA (8th ed.) Citation

Helton, Walter Lee. Kentucky's Rocks and Minerals. University of Kentucky, 1964.