APA
Singh S., Singh S., . (1997). environmental geography. Allahabad: Prayag Pustak Bhavan.
Chicago
Singh Savindra, Singh Savindra, . 1997. environmental geography. Allahabad: Prayag Pustak Bhavan.
Harvard
Singh S., Singh S., . (1997). environmental geography. Allahabad: Prayag Pustak Bhavan.
MLA
Singh Savindra, Singh Savindra, . environmental geography. Allahabad: Prayag Pustak Bhavan. 1997.