Chester, T. (1997). Mastering excel 97 (4th.). BPB.
Lua i Stíl Chicago (17ú heag.)Chester, Thomas. Mastering Excel 97. 4th. New delhi: BPB, 1997.
Lua MLA (9ú heag.)Chester, Thomas. Mastering Excel 97. 4th. BPB, 1997.
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