Simpson, A. (1986). Advanced techniques in dBase III plus. B.P.B. Pub.
Lua i Stíl Chicago (17ú heag.)Simpson, Alan. Advanced Techniques in DBase III Plus. Delhi: B.P.B. Pub, 1986.
Lua MLA (9ú heag.)Simpson, Alan. Advanced Techniques in DBase III Plus. B.P.B. Pub, 1986.
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