Παραπομπή APA

Manoharan, T. M. (1999). Silent valley whispers of reason. Kerala forest department.

Παραπομπή Chicago Style

Manoharan, T. M. Silent Valley Whispers of Reason. Thiruvananthapuram: Kerala forest department, 1999.

Παραπομπή MLA

Manoharan, T. M. Silent Valley Whispers of Reason. Kerala forest department, 1999.