Gaya APA

GRAUER, R, T., VILLAR, V. (1991). COBOL FROM MICRO TO MAINFRANCE STRUCTURED COBOL PROGRAMMING VOL. 1 . : .

Gaya MLA

GRAUER, Robert, T., VILLAR, Vazquez. "COBOL FROM MICRO TO MAINFRANCE STRUCTURED COBOL PROGRAMMING VOL. 1". : , 1991. Text.