Não informado. (1971). Bulletin of Economic Research. University of Hull, Department of Economics.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Bulletin of Economic Research. Hull, Inglaterra: University of Hull, Department of Economics, 1971.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Bulletin of Economic Research. University of Hull, Department of Economics, 1971.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.