Citazione Stile APA (7a Edizione)

Gupta, O. (1998). Weed management : Principles and practices .: O.P. Gupta. Agro Botanica.

Citazione stile Chigago Style (17a edizione)

Gupta, O.P. Weed Management : Principles and Practices .: O.P. Gupta. New Delhi: Agro Botanica, 1998.

Citatione MLA (9a ed.)

Gupta, O.P. Weed Management : Principles and Practices .: O.P. Gupta. Agro Botanica, 1998.