omar, a. (1970). on the maintance of a system of machines by one repairman. the institute of national planning.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रomar, ahmed. On the Maintance of a System of Machines by One Repairman. cairo: the institute of national planning, 1970.
एमएलए (9वां संस्करण) प्रशस्ति पत्रomar, ahmed. On the Maintance of a System of Machines by One Repairman. the institute of national planning, 1970.
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