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শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিFenner Conference on Nature Tourism and the Environment Canberra, A.C.T, Inc ebrary, Ralf Buckley, C. Pickering, এবং David B. Weaver. Nature-based Tourism, Environment, and Land Management. Wallingford, Oxon, UK ; Cambridge, MA, USA: CABI Pub., 2003.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিFenner Conference on Nature Tourism and the Environment Canberra, A.C.T, et al. Nature-based Tourism, Environment, and Land Management. CABI Pub., 2003.
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