Norton, P. (1990). The new Norton guides: DBASE III Plus and dBASE IV [disket]. New York : Brady Software.
Chicago Style (17th ed.) CitationNorton, Peter. The New Norton Guides: DBASE III Plus and DBASE IV [disket]. New York : Brady Software, 1990.
MLA (9th ed.) CitationNorton, Peter. The New Norton Guides: DBASE III Plus and DBASE IV [disket]. New York : Brady Software, 1990.
Warning: These citations may not always be 100% accurate.