NCC Education Services. (1999). Systems Analysis Techniques. NCC Education Services.
Cita Chicago (17th ed.)NCC Education Services. Systems Analysis Techniques. Manchester: NCC Education Services, 1999.
Cita MLA (9th ed.)NCC Education Services. Systems Analysis Techniques. NCC Education Services, 1999.
Atenció: Aquestes cites poden no estar 100% correctes.