Cita APA

Coffman, J. S., Service, A. L., & Petersen N. S. (1967). An evaluation of the western phosphate industry and its resources. U. S. Dept. of the Interior, Bureau of Mines.

Citación estilo Chicago

Coffman, J. S., A. L. Service, and Petersen N. S. An Evaluation of the Western Phosphate Industry and Its Resources. [Washington]: U. S. Dept. of the Interior, Bureau of Mines, 1967.

Cita MLA

Coffman, J. S., A. L. Service, and Petersen N. S. An Evaluation of the Western Phosphate Industry and Its Resources. [Washington]: U. S. Dept. of the Interior, Bureau of Mines, 1967.