Cita APA (7th ed.)

Lupton, G. N. (1981). Generating colour shaded images by computer: VIGIL, an aid to highway design. Transport and Road Research Laboratory.

Cita Chicago (17th ed.)

Lupton, G. N. Generating Colour Shaded Images by Computer: VIGIL, an Aid to Highway Design. Crowthorne, Berkshire: Transport and Road Research Laboratory, 1981.

Cita MLA (9th ed.)

Lupton, G. N. Generating Colour Shaded Images by Computer: VIGIL, an Aid to Highway Design. Transport and Road Research Laboratory, 1981.