APA

Planning and Transport Research and Computation International Association, . (19). Perspectives / PTRC. London: PTRC Education and Research Services.

Chicago

Planning and Transport Research and Computation International Association, . 19. Perspectives / PTRC. London: PTRC Education and Research Services.

Harvard

Planning and Transport Research and Computation International Association, . (19). Perspectives / PTRC. London: PTRC Education and Research Services.

MLA

Planning and Transport Research and Computation International Association, . Perspectives / PTRC. London: PTRC Education and Research Services. 19.