Transportation Quarterly. ENO Transportation Foundation.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रTransportation Quarterly. ENO Transportation Foundation.
एमएलए (9वां संस्करण) प्रशस्ति पत्रTransportation Quarterly. ENO Transportation Foundation.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.