Παραπομπή APA

Ravivarma,TR. (1986). Vazhakrishi. Kerala Agricultural University.

Παραπομπή Chicago Style

Ravivarma,TR. Vazhakrishi. Thrissur: Kerala Agricultural University, 1986.

Παραπομπή MLA

Ravivarma,TR. Vazhakrishi. Kerala Agricultural University, 1986.