United States. Federal Transit Administration, Transit Cooperative Research Program, Transit Development Corporation, National Research Council (U.S.). Transportation Research Board, Multisystems, Inc, Mundle & Associates, & Parsons Transportation Group. (2002). A toolkit for self-service, barrier-free fare collection. National Academy Press.

United States. Federal Transit Administration, Transit Cooperative Research Program, Transit Development Corporation, National Research Council (U.S.). Transportation Research Board, Inc Multisystems, Mundle & Associates, and Parsons Transportation Group. A Toolkit for Self-service, Barrier-free Fare Collection. Washington, D.C: National Academy Press, 2002.

United States. Federal Transit Administration, et al. A Toolkit for Self-service, Barrier-free Fare Collection. National Academy Press, 2002.