Cita APA

Van Lieu, J., & Patterson, E. D. 1. (1964). Coal resources of Lawrence County, Pennsylvania. Washington: U.S. Government Printing Office.

Citación estilo Chicago

Van Lieu, J.A., y Elmer Davisson 1916- Patterson. Coal Resources of Lawrence County, Pennsylvania. Washington: U.S. Government Printing Office, 1964.

Cita MLA

Van Lieu, J.A., y Elmer Davisson 1916- Patterson. Coal Resources of Lawrence County, Pennsylvania. Washington: U.S. Government Printing Office, 1964.