FOX SOFTWARE. (1990). FOXPRO: USER`S GUIDE. FOX SOFTWARE.
Lua i Stíl Chicago (17ú heag.)FOX SOFTWARE. FOXPRO: USER`S GUIDE. FOX SOFTWARE, 1990.
Lua MLA (9ú heag.)FOX SOFTWARE. FOXPRO: USER`S GUIDE. FOX SOFTWARE, 1990.
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