Cita APA

Ludman, A., & Coch, N. K. (1982). Physical geology. McGraw-Hill.

Citación estilo Chicago

Ludman, Allan, and Nicholas K. Coch. Physical Geology. New York: McGraw-Hill, 1982.

Cita MLA

Ludman, Allan, and Nicholas K. Coch. Physical Geology. McGraw-Hill, 1982.