Semer-Purzycki, J. (1989). A practical guide to travel fares and ticketing. Delmar Publishers.
Lua i Stíl Chicago (17ú heag.)Semer-Purzycki, Jeanne. A Practical Guide to Travel Fares and Ticketing. Albany, N.Y: Delmar Publishers, 1989.
Lua MLA (9ú heag.)Semer-Purzycki, Jeanne. A Practical Guide to Travel Fares and Ticketing. Delmar Publishers, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.