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শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিTHEORIES OF LANDFORM.., Wilton N. [ed] MELHORN, এবং Ronald C. [ed] FLEMAL. Theories of Landform Development/editor Wilton N. Melhorn; Ronald C. Flemal. London: George Allen and Unwin, 1981.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিTHEORIES OF LANDFORM.., et al. Theories of Landform Development/editor Wilton N. Melhorn; Ronald C. Flemal. George Allen and Unwin, 1981.
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