Παραπομπή APA

Gupta, O. P. (1987). Aquatic weed management: A textbook and manual (2.).

Παραπομπή Chicago Style

Gupta, O P. Aquatic Weed Management: A Textbook and Manual. 2. Today & Tomorrows Book Agency, New Delhi, 1987.

Παραπομπή MLA

Gupta, O P. Aquatic Weed Management: A Textbook and Manual. 2. 1987.