Norton, P. (2003). Peter Norton's essential concepts (5th ed.). Glencoe / McGraw-Hill.
Citazione stile Chigago Style (17a edizione)Norton, Peter. Peter Norton's Essential Concepts. 5th ed. Columbus, Ohio: Glencoe / McGraw-Hill, 2003.
Citatione MLA (9a ed.)Norton, Peter. Peter Norton's Essential Concepts. 5th ed. Glencoe / McGraw-Hill, 2003.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.