Cita APA (7a ed.)

Foster, R. J. (1971). Physical Geology. Charles E. Merrill Publishing Company..

Cita Chicago Style (17a ed.)

Foster, Robert J. Physical Geology. Columbus, Ohio: Charles E. Merrill Publishing Company., 1971.

Cita MLA (9a ed.)

Foster, Robert J. Physical Geology. Charles E. Merrill Publishing Company., 1971.