NCC Education. (2000). System analysis techniques. NCC Education.
Citazione stile Chigago Style (17a edizione)NCC Education. System Analysis Techniques. Manchester, UK: NCC Education, 2000.
Citatione MLA (9a ed.)NCC Education. System Analysis Techniques. NCC Education, 2000.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.