CHARLES, D. D. O. (1997). Air transportation in Nigeria strategies for 21st century. : The Nigeria Stock Exchange.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCHARLES, Diepiriye David Onyiuke. Air Transportation in Nigeria Strategies for 21st Century. : The Nigeria Stock Exchange, 1997.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCHARLES, Diepiriye David Onyiuke. Air Transportation in Nigeria Strategies for 21st Century. : The Nigeria Stock Exchange, 1997.
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