Παραπομπή APA

U.K.Singh & Sudarshan,K.N. (2004). Distance education. Discovery.

Παραπομπή Chicago Style

U.K.Singh και Sudarshan,K.N. Distance Education. New Delhi: Discovery, 2004.

Παραπομπή MLA

U.K.Singh και Sudarshan,K.N. Distance Education. Discovery, 2004.