tinbergen, j. (1964). development planning: The sector phase with different gestation periods. the institute of national planning.
Չիկագոյի ոճի (17րդ խմբ.) մեջբերումtinbergen, j. Development Planning: The Sector Phase with Different Gestation Periods. cairo: the institute of national planning, 1964.
MLA (9րդ խմբ.) Մեջբերումtinbergen, j. Development Planning: The Sector Phase with Different Gestation Periods. the institute of national planning, 1964.