एपीए उद्धरण

Manoharan, T., & Biju, S. N. (1999). Silent valley: Whispers of reason. Kerala Forest Department.

शिकागो स्टाइल उद्धरण

Manoharan, T.M, और S.D. Nayar Biju. Silent Valley: Whispers of Reason. Thiruvananthapuram: Kerala Forest Department, 1999.

एमएलए उद्धरण

Manoharan, T.M, और S.D. Nayar Biju. Silent Valley: Whispers of Reason. Kerala Forest Department, 1999.