Παραπομπή APA

Prasad, P. G. (2012). Ecotourism and its development. Altar.

Παραπομπή Chicago Style

Prasad, P.N. Girija. Ecotourism and Its Development. New Delhi: Altar, 2012.

Παραπομπή MLA

Prasad, P.N. Girija. Ecotourism and Its Development. Altar, 2012.