APA (7th ed.) Citation

Allen, J. R. L. (1975). Physical geology. G. Allen & Unwin.

Chicago Style (17th ed.) Citation

Allen, John R. L. Physical Geology. London ; Boston: G. Allen & Unwin, 1975.

MLA (9th ed.) Citation

Allen, John R. L. Physical Geology. G. Allen & Unwin, 1975.

Warning: These citations may not always be 100% accurate.