Παραπομπή APA

P.R.Trivedi. (1999). Encyclopaedia of world environment: 5vols. APH.

Παραπομπή Chicago Style

P.R.Trivedi. Encyclopaedia of World Environment: 5vols. New Delhi: APH, 1999.

Παραπομπή MLA

P.R.Trivedi. Encyclopaedia of World Environment: 5vols. APH, 1999.