Cita APA (7th ed.)
Puri, U. (2006). Distance education. Pragun Publications.
Cita Chicago (17th ed.)
Puri, Usha. Distance Education. New Delhi: Pragun Publications, 2006.
Cita MLA (9th ed.)
Puri, Usha. Distance Education. Pragun Publications, 2006.
Atenció: Aquestes cites poden no estar 100% correctes.