Cita APA (7th ed.)
Norton, P. (2003). Peter Norton's essential concepts (5th ed.). Glencoe/McGraw-Hill.
Cita Chicago (17th ed.)
Norton, Peter. Peter Norton's Essential Concepts. 5th ed. New York: Glencoe/McGraw-Hill, 2003.
Cita MLA (9th ed.)
Norton, Peter. Peter Norton's Essential Concepts. 5th ed. Glencoe/McGraw-Hill, 2003.
Atenció: Aquestes cites poden no estar 100% correctes.