Cita APA (7th ed.)

Colwill, D. M., Butler, J. D., & Crossley, P. (1981). Polynuclear aromatic hydrocarbons in the atmosphere in Birmingham. Transport and Road Research Laboratory.

Cita Chicago (17th ed.)

Colwill, D. M., J. D. Butler, i P. Crossley. Polynuclear Aromatic Hydrocarbons in the Atmosphere in Birmingham. Crowthorne, Berkshire: Transport and Road Research Laboratory, 1981.

Cita MLA (9th ed.)

Colwill, D. M., et al. Polynuclear Aromatic Hydrocarbons in the Atmosphere in Birmingham. Transport and Road Research Laboratory, 1981.