Budlong, M. (2000). SAMS Teach Yourself COBOL in 21 Days (3. Ed.). SAMS.
Chicago-Zitierstil (17. Ausg.)Budlong, Mo. SAMS Teach Yourself COBOL in 21 Days. 3. Ed. Indianapolis, Ind.: SAMS, 2000.
MLA-Zitierstil (8. Ausg.)Budlong, Mo. SAMS Teach Yourself COBOL in 21 Days. 3. Ed. SAMS, 2000.
警告：這些引文格式不一定是100％准確.