APA (7a ed.)

International Teletraffic Congress (15th : 1997 : Washington, D., Ramaswami, V., & Wirth, P. e. (1997). Teletraffic contributions for the information age : proceedings of the 15th International Teletraffic Congress--ITC-15, Washington, D.C., USA, 22-27 June, 1977. Elsevier.