Παραπομπή APA

Kumar P S G. (2012). Colon classification (6.). ESS ESS publication.

Παραπομπή Chicago Style

Kumar P S G. Colon Classification. 6. New Delhi: ESS ESS publication, 2012.

Παραπομπή MLA

Kumar P S G. Colon Classification. 6. ESS ESS publication, 2012.