Townsend, C. (1992). Mastering dBase IV programming. Sybex, Illinois.
Lua i Stíl Chicago (17ú heag.)Townsend, Carl. Mastering DBase IV Programming. San Francisco : Glencoe: Sybex, Illinois, 1992.
Lua MLA (8ú heag.)Townsend, Carl. Mastering DBase IV Programming. Sybex, Illinois, 1992.
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