Cita APA (7th ed.)

Townsend, C. (1992). Mastering dBase IV programming. Sybex, Illinois.

Cita Chicago (17th ed.)

Townsend, Carl. Mastering DBase IV Programming. San Francisco : Glencoe: Sybex, Illinois, 1992.

Cita MLA (8th ed.)

Townsend, Carl. Mastering DBase IV Programming. Sybex, Illinois, 1992.