(1997). Teach yourself Cobol in 21 days / Mo Budlong.
Chicago-čujuhus (17. p.)Teach Yourself Cobol in 21 Days / Mo Budlong. 1997.
MLA-čujuhus (9. p.)Teach Yourself Cobol in 21 Days / Mo Budlong. 1997.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.