tinbergen, j. (1964). development planning: The sector phase with different gestation periods. the institute of national planning.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিtinbergen, j. Development Planning: The Sector Phase with Different Gestation Periods. cairo: the institute of national planning, 1964.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিtinbergen, j. Development Planning: The Sector Phase with Different Gestation Periods. the institute of national planning, 1964.