APA (7e ed.) Bronvermelding

Walmsley, D. A. (1979). A parametric model of inter-city passenger transport. Transport and Road Research Laboratory.

Chicago (17e ed.) Bronvermelding

Walmsley, D. A. A Parametric Model of Inter-city Passenger Transport. Crowthorne, [Eng.]: Transport and Road Research Laboratory, 1979.

MLA (9e ed.) Bronvermelding

Walmsley, D. A. A Parametric Model of Inter-city Passenger Transport. Transport and Road Research Laboratory, 1979.