Παραπομπή APA

Gupta, O. P. (1985). Aquatic weeds: :their menace and control. Today printers.

Παραπομπή Chicago Style

Gupta, O P. Aquatic Weeds: :their Menace and Control. New delhi: Today printers, 1985.

Παραπομπή MLA

Gupta, O P. Aquatic Weeds: :their Menace and Control. Today printers, 1985.