Khan, D. N. (1998). Quantitative methods in geographical research. Concept.
Chicago-čujuhus (17. p.)Khan, Dr.(Mrs.) Najma. Quantitative Methods in Geographical Research. New Delhi: Concept, 1998.
MLA-čujuhus (9. p.)Khan, Dr.(Mrs.) Najma. Quantitative Methods in Geographical Research. Concept, 1998.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.