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শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিPhilippines. National Economic Development Authority. Development in Region I: An Annotated Bibliography. [San Fernando, La Union]: National Economic Development Authority, 1975.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিPhilippines. National Economic Development Authority. Development in Region I: An Annotated Bibliography. National Economic Development Authority, 1975.
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