Gupta,O P. (1987). Aquatic weed management: A text book and manual. Today and Tomarrows Printers and Publishers.
Styl ChicagoGupta,O P. Aquatic Weed Management: A Text Book and Manual. New Delhi: Today and Tomarrows Printers and Publishers, 1987.
Citace podle MLAGupta,O P. Aquatic Weed Management: A Text Book and Manual. Today and Tomarrows Printers and Publishers, 1987.
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