Ferrett, R. L., Preston, J., & Preston, S. (1998). Learn PowerPoint 97 [Đĩa CD-ROM]. Indianapolis: Que Corporation.
Chicago Style aipamenaFerrett, Robert L., John Preston, và Sally Preston. Learn PowerPoint 97 [Đĩa CD-ROM]. Indianapolis: Que Corporation, 1998.
MLA aipamenaFerrett, Robert L., John Preston, và Sally Preston. Learn PowerPoint 97 [Đĩa CD-ROM]. Indianapolis: Que Corporation, 1998.
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