APA-referens

Ahlgren, G. H., Kingman, G. C., & Wolf, D. E. (1951). Principles of weed control. John Wiley & Sons INC.

Chicago-stil citat

Ahlgren, Gilbert H., Glenn C. Kingman, och Dale E. Wolf. Principles of Weed Control. NewYork: John Wiley & Sons INC, 1951.

MLA-referens

Ahlgren, Gilbert H., et al. Principles of Weed Control. John Wiley & Sons INC, 1951.