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শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিUnited States. Bureau of Community Environmental Management. Environmental Health Planning. [Washington: For sale by the Supt. of Docs., U.S. Govt. Print. Off.], 1971.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিUnited States. Bureau of Community Environmental Management. Environmental Health Planning. For sale by the Supt. of Docs., U.S. Govt. Print. Off.], 1971.
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