qayum, a. (1964). an extension of black's optimum savings model. the institute of national planning.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিqayum, a. An Extension of Black's Optimum Savings Model. cairo: the institute of national planning, 1964.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিqayum, a. An Extension of Black's Optimum Savings Model. the institute of national planning, 1964.