APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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