Cita APA (7th ed.)

Bly, P. H., & Webster, F. V. (1981). Changing the cost of travel. Transport and Road Research Laboratory.

Cita Chicago (17th ed.)

Bly, P. H., i F. V. Webster. Changing the Cost of Travel. Crowthorne, Berkshire: Transport and Road Research Laboratory, 1981.

Cita MLA (9th ed.)

Bly, P. H., i F. V. Webster. Changing the Cost of Travel. Transport and Road Research Laboratory, 1981.