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শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিOrganisation for Economic Co-operation and Development. Comparisons Between Member Countries in Education, Research & Development, Technological Innovation, International Economic Exchanges. Paris, 1970.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিOrganisation for Economic Co-operation and Development. Comparisons Between Member Countries in Education, Research & Development, Technological Innovation, International Economic Exchanges. 1970.
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