Bernd Held. (2011). Microsoft Excel functions and formulas (2nd ed.). Mercury Learning and Information.
Lua i Stíl Chicago (17ú heag.)Bernd Held. Microsoft Excel Functions and Formulas. 2nd ed. Dulles, VA: Mercury Learning and Information, 2011.
Lua MLA (8ú heag.)Bernd Held. Microsoft Excel Functions and Formulas. 2nd ed. Mercury Learning and Information, 2011.
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