Semer-Purzycki, J. (1989). A practical guide to travel fares and ticketing. Delmar Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSemer-Purzycki, Jeanne. A Practical Guide to Travel Fares and Ticketing. Albany, N.Y: Delmar Publishers, 1989.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSemer-Purzycki, Jeanne. A Practical Guide to Travel Fares and Ticketing. Delmar Publishers, 1989.
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