APA
Khan N., . (1998). Quantitative methods in geograpical research. New Delhi: Concept Publishing Company.
Chicago
Khan Najma, . 1998. Quantitative methods in geograpical research. New Delhi: Concept Publishing Company.
Harvard
Khan N., . (1998). Quantitative methods in geograpical research. New Delhi: Concept Publishing Company.
MLA
Khan Najma, . Quantitative methods in geograpical research. New Delhi: Concept Publishing Company. 1998.