engert, m. (1964). classification of industries in social countries. the institute of national planning.
Tohutoru Kātū Chicago (17th ed.)engert, manfred. Classification of Industries in Social Countries. cairo: the institute of national planning, 1964.
Tohutoro MLA (9th ed.)engert, manfred. Classification of Industries in Social Countries. the institute of national planning, 1964.
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