Sanders, J. E. (1981). Principles of physical geology. Wiley.
Chicago-čujuhus (17. p.)Sanders, John E. Principles of Physical Geology. New York: Wiley, 1981.
MLA-čujuhus (9. p.)Sanders, John E. Principles of Physical Geology. Wiley, 1981.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.