(1981). Business system buyer's guide. California: OSBORNE/ McGraw- Hill.
Trích dẫn kiểu ChicagoBusiness System Buyer's Guide. California: OSBORNE/ McGraw- Hill, 1981.
ציטוט MLABusiness System Buyer's Guide. California: OSBORNE/ McGraw- Hill, 1981.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.