Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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