Norton, P. (2003). Excel 2002: A tutorial to accompany Peter Norton's introduction to computers (4th ed.). Glencoe/McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Norton, Peter. Excel 2002: A Tutorial to Accompany Peter Norton's Introduction to Computers. 4th ed. Columbus, OH: Glencoe/McGraw-Hill, 2003.
Lua MLA (8ú heag.)Norton, Peter. Excel 2002: A Tutorial to Accompany Peter Norton's Introduction to Computers. 4th ed. Glencoe/McGraw-Hill, 2003.
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