Παραπομπή APA

Manoharan, T. (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.