Jones, W. B., & Harper, R. M. (1935). History and work of geological surveys and industrial development in Alabama. Geological Survey of Alabama.
Lua i Stíl Chicago (17ú heag.)Jones, Walter B., agus Roland M. Harper. History and Work of Geological Surveys and Industrial Development in Alabama. University, Ala.: Geological Survey of Alabama, 1935.
Lua MLA (8ú heag.)Jones, Walter B., agus Roland M. Harper. History and Work of Geological Surveys and Industrial Development in Alabama. Geological Survey of Alabama, 1935.
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