Arnaud Gerkens, J. (1989). Foundation of exploration geographics. Elsevier.
Chicago-čujuhus (17. p.)Arnaud Gerkens, J..C.d. Foundation of Exploration Geographics. New York: Elsevier, 1989.
MLA-čujuhus (9. p.)Arnaud Gerkens, J..C.d. Foundation of Exploration Geographics. Elsevier, 1989.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.