Gupta, O. (1998). Modern weed management: With special reference to agriculture in the tropics ... Botanica.
Lua i Stíl Chicago (17ú heag.)Gupta, O.P. Modern Weed Management: With Special Reference to Agriculture in the Tropics ... New Delhi: Botanica, 1998.
Lua MLA (9ú heag.)Gupta, O.P. Modern Weed Management: With Special Reference to Agriculture in the Tropics ... Botanica, 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.