Pallmann, D. (2002). Network query language (NQL). Wiley.
Cita Chicago (17th ed.)Pallmann, David. Network Query Language (NQL). New York: Wiley, 2002.
Cita MLA (9th ed.)Pallmann, David. Network Query Language (NQL). Wiley, 2002.
Atenció: Aquestes cites poden no estar 100% correctes.