Philippakis, A. S., & Kazmier, L. J. (1981). Structured COBOL (2nd ed.). McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Philippakis, Andreas S., agus Leonard J. Kazmier. Structured COBOL. 2nd ed. New York: McGraw-Hill, 1981.
Lua MLA (9ú heag.)Philippakis, Andreas S., agus Leonard J. Kazmier. Structured COBOL. 2nd ed. McGraw-Hill, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.