Kumar, K. (1984). Reference service (4th.). Vikas.
Cita Chicago (17th ed.)Kumar, Krishan. Reference Service. 4th. New Delhi: Vikas, 1984.
Cita MLA (9th ed.)Kumar, Krishan. Reference Service. 4th. Vikas, 1984.
Atenció: Aquestes cites poden no estar 100% correctes.