Manoharan, T. M. (1999). Silent valley whispers of reason. Kerala forest department.
Chicago Edition CitationManoharan, T. M. Silent Valley Whispers of Reason. Thiruvananthapuram: Kerala forest department, 1999.
Cita MLAManoharan, T. M. Silent Valley Whispers of Reason. Kerala forest department, 1999.
Atenció: Aquestes cites poden no estar 100% correctes.