engert, m. (1964). classification of industries in social countries. the institute of national planning.
Style de citation Chicago (17e éd.)engert, manfred. Classification of Industries in Social Countries. cairo: the institute of national planning, 1964.
Style de citation MLA (9e éd.)engert, manfred. Classification of Industries in Social Countries. the institute of national planning, 1964.
Attention : ces citations peuvent ne pas être correctes à 100%.