Não informado. (1961). Development Assistance. Organization for Economic Co-operation and Development.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Development Assistance. Paris: Organization for Economic Co-operation and Development, 1961.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Development Assistance. Organization for Economic Co-operation and Development, 1961.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.