(1969). COBOL program fundamentals ; programmed instruction.
Chicago-čujuhus (17. p.)COBOL Program Fundamentals ; Programmed Instruction. 1969.
MLA-čujuhus (9. p.)COBOL Program Fundamentals ; Programmed Instruction. 1969.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.