APA (7th ed.) Citation

Mullens, M. C., & Roberts, A. E. (1972). Selected annotated bibliography on asphalt-bearing rocks of the United States and Canada, to 1970. United States Department of the Interior, Geological Survey.

Chicago Style (17th ed.) Citation

Mullens, Marjorie C., and Albert Eugene Roberts. Selected Annotated Bibliography on Asphalt-bearing Rocks of the United States and Canada, to 1970. [Washington, D.C.]: United States Department of the Interior, Geological Survey, 1972.

MLA (9th ed.) Citation

Mullens, Marjorie C., and Albert Eugene Roberts. Selected Annotated Bibliography on Asphalt-bearing Rocks of the United States and Canada, to 1970. United States Department of the Interior, Geological Survey, 1972.