yesfu, t. m. (1962). manpower and economic development in nigeria. the institute of national planning.
Čikaški stil citiranja (17. izdanje)yesfu, t. m. Manpower and Economic Development in Nigeria. cairo: the institute of national planning, 1962.
MLA način citiranja (9. izdanje)yesfu, t. m. Manpower and Economic Development in Nigeria. the institute of national planning, 1962.
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