Vesely, E. G. (1989). COBOL: A guide to structured, portable, maintainable, and efficient program design. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Vesely, Eric Garrigue. COBOL: A Guide to Structured, Portable, Maintainable, and Efficient Program Design. Englewood Cliffs, N.J.: Prentice Hall, 1989.
Lua MLA (9ú heag.)Vesely, Eric Garrigue. COBOL: A Guide to Structured, Portable, Maintainable, and Efficient Program Design. Prentice Hall, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.