Não informado. (2009). Main Science and Technology Indicators. Organization for Economic Co-operation and Development.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Main Science and Technology Indicators. Paris: Organization for Economic Co-operation and Development, 2009.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Main Science and Technology Indicators. Organization for Economic Co-operation and Development, 2009.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.