(1981). Business system buyer's guide. California: OSBORNE/ McGraw- Hill.
Chicago Style aipamenaBusiness System Buyer's Guide. California: OSBORNE/ McGraw- Hill, 1981.
MLA aipamenaBusiness System Buyer's Guide. California: OSBORNE/ McGraw- Hill, 1981.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.