Cita APA (7a ed.)

Lans, R. F. v. d. (1991). An SQL guide for dBASE IV. Addison-Wesley.

Cita Chicago Style (17a ed.)

Lans, Rick F. van der. An SQL Guide for DBASE IV. Wokingham [etc.]: Addison-Wesley, 1991.

Cita MLA (9a ed.)

Lans, Rick F. van der. An SQL Guide for DBASE IV. Addison-Wesley, 1991.