Official Airline Guides, inc. (1991). OAG desktop flight guide (Worldwide ed.). Official Airline Guides.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रOfficial Airline Guides, inc. OAG Desktop Flight Guide. Worldwide ed. Oak Brook, Ill.: Official Airline Guides, 1991.
एमएलए (8वां संस्करण) प्रशस्ति पत्रOfficial Airline Guides, inc. OAG Desktop Flight Guide. Worldwide ed. Official Airline Guides, 1991.
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