Plummer, C. C. (2001). Physical geology: Featuring the smithsonian institution's journey through geology CD-ROM. McGraw-Hill.
Chicago-čujuhus (17. p.)Plummer, Charles C. Physical Geology: Featuring the Smithsonian Institution's Journey Through Geology CD-ROM. Boston: McGraw-Hill, 2001.
MLA-čujuhus (9. p.)Plummer, Charles C. Physical Geology: Featuring the Smithsonian Institution's Journey Through Geology CD-ROM. McGraw-Hill, 2001.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.