APA

Frith B., Barbour I., . (1992). Goods vehicle surveys at four VIM pre-selection sites (1990/1991). Crowthorne: Transport Research Laboratory. TRL.

Chicago

Frith BA, Barbour IA, . 1992. Goods vehicle surveys at four VIM pre-selection sites (1990/1991). Crowthorne: Transport Research Laboratory. TRL.

Harvard

Frith B., Barbour I., . (1992). Goods vehicle surveys at four VIM pre-selection sites (1990/1991). Crowthorne: Transport Research Laboratory. TRL.

MLA

Frith BA, Barbour IA, . Goods vehicle surveys at four VIM pre-selection sites (1990/1991). Crowthorne: Transport Research Laboratory. TRL. 1992.