American Transit Association, Purdue University. School of Civil Engineering, & National Research Council (U.S.). Highway Research Board. (1973). Public transportation research needs: Proceedings of a conference, Purdue University, November 4-5, 1971. [Highway Research Board] National Research Council.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)American Transit Association, Purdue University. School of Civil Engineering, và National Research Council (U.S.). Highway Research Board. Public Transportation Research Needs: Proceedings of a Conference, Purdue University, November 4-5, 1971. Washington, D.C: [Highway Research Board] National Research Council, 1973.
Trích dẫn kiểu MLA (xuất bản lần thứ 9)American Transit Association, et al. Public Transportation Research Needs: Proceedings of a Conference, Purdue University, November 4-5, 1971. [Highway Research Board] National Research Council, 1973.