James A Saxon. (1971). COBOL: A self insturctional manual. Newjersey.
Chicago Style aipamenaJames A Saxon. COBOL: A Self Insturctional Manual. Newjersey, 1971.
MLA aipamenaJames A Saxon. COBOL: A Self Insturctional Manual. Newjersey, 1971.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.