Trewartha, . G. T., Robinson, A. H., & Hammond, E. H. (1967). Physical elements of geography (5th ed.). McGraw-Hill.
Chicago-čujuhus (17. p.)Trewartha, Glenn T., Arthur H. Robinson, juo Edwin H. Hammond. Physical Elements of Geography. 5th ed. New York: McGraw-Hill, 1967.
MLA-čujuhus (9. p.)Trewartha, Glenn T., et al. Physical Elements of Geography. 5th ed. McGraw-Hill, 1967.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.