Semer-Purzycki, J. (1994). A practical guide to fares and ticketing (2nd ed.). Delmar Pub.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSemer-Purzycki, Jeanne. A Practical Guide to Fares and Ticketing. 2nd ed. Albany, NY: Delmar Pub, 1994.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSemer-Purzycki, Jeanne. A Practical Guide to Fares and Ticketing. 2nd ed. Delmar Pub, 1994.
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