Gillaly, J. (1968). Principles of geology. W. H. Freeman.
Chicago-čujuhus (17. p.)Gillaly, James. Principles of Geology. San Francisco: W. H. Freeman, 1968.
MLA-čujuhus (9. p.)Gillaly, James. Principles of Geology. W. H. Freeman, 1968.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.