APA (7e ed.) Bronvermelding

National Research Council (U.S.). Transportation Research Board. Committee A3B05. (1990). Travelers' services: Research problem statements. Transportation Research Board, National Research Council.

Chicago (17e ed.) Bronvermelding

National Research Council (U.S.). Transportation Research Board. Committee A3B05. Travelers' Services: Research Problem Statements. Washington, DC: Transportation Research Board, National Research Council, 1990.

MLA (9e ed.) Bronvermelding

National Research Council (U.S.). Transportation Research Board. Committee A3B05. Travelers' Services: Research Problem Statements. Transportation Research Board, National Research Council, 1990.