DUNCAN RAY. (1988). ADVANCED MSDOS (2ND.). MICROSOFT.
Lua i Stíl Chicago (17ú heag.)DUNCAN RAY. ADVANCED MSDOS. 2ND. U S A: MICROSOFT, 1988.
Lua MLA (9ú heag.)DUNCAN RAY. ADVANCED MSDOS. 2ND. MICROSOFT, 1988.
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