Norton, P. (2003). Peter Norton's essential concepts. New York: Glencoe/McGraw-Hill.
Trích dẫn kiểu ChicagoNorton, Peter. Peter Norton's Essential Concepts. New York: Glencoe/McGraw-Hill, 2003.
MLA citiranjeNorton, Peter. Peter Norton's Essential Concepts. New York: Glencoe/McGraw-Hill, 2003.
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