Shelly, G. B. (2000). Structured cobol programming (2nd ed.). Course Technology.
Citazione stile Chigago Style (17a edizione)Shelly, Gary B. Structured Cobol Programming. 2nd ed. Cambridge, Massachusetts: Course Technology, 2000.
Citatione MLA (9a ed.)Shelly, Gary B. Structured Cobol Programming. 2nd ed. Course Technology, 2000.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.