APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (8:e uppl.)

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