Không rõ. (2001). About Customers: Gathering Information. Youth PublishingHouse.
Trích dẫn kiểu ChicagoKhông rõ. About Customers: Gathering Information. Youth PublishingHouse, 2001.
ציטוט MLAKhông rõ. About Customers: Gathering Information. Youth PublishingHouse, 2001.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.