Dyfyniad APA

Onkar singh et al. (1993). Frontiers in environmental geography. Concept Publishing Company.

Dyfyniad Arddull Chicago

Onkar singh et al. Frontiers in Environmental Geography. New Delhi: Concept Publishing Company, 1993.

Dyfyniad MLA

Onkar singh et al. Frontiers in Environmental Geography. Concept Publishing Company, 1993.

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