APA (7th ed.) Citation

Simpson, A. (1993). Understanding dBASE IV 2.0 for DOS (4th ed.). Sybex.

Chicago Style (17th ed.) Citation

Simpson, Alan. Understanding DBASE IV 2.0 for DOS. 4th ed. San Francisco, CA: Sybex, 1993.

MLA (8th ed.) Citation

Simpson, Alan. Understanding DBASE IV 2.0 for DOS. 4th ed. Sybex, 1993.