APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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