linsel, h., & sack, k. (1965). classification of national econom. the institute of national planning.
Tohutoru Kātū Chicago (17th ed.)linsel, hermann, me kurt sack. Classification of National Econom. cairo: the institute of national planning, 1965.
Tohutoro MLA (9th ed.)linsel, hermann, me kurt sack. Classification of National Econom. the institute of national planning, 1965.
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