APA (7e ed.) Bronvermelding

Bernd Held. (2011). Microsoft Excel functions and formulas (2nd ed.). Mercury Learning and Information.

Chicago (17e ed.) Bronvermelding

Bernd Held. Microsoft Excel Functions and Formulas. 2nd ed. Dulles, VA: Mercury Learning and Information, 2011.

MLA (8e ed.) Bronvermelding

Bernd Held. Microsoft Excel Functions and Formulas. 2nd ed. Mercury Learning and Information, 2011.