Sabin, W. A. (2001). The Gregg reference manual (9th ed.). Boston: McGraw-Hill.
Trích dẫn kiểu ChicagoSabin, William A. The Gregg Reference Manual. 9th ed. Boston: McGraw-Hill, 2001.
Deismireacht MLASabin, William A. The Gregg Reference Manual. 9th ed. Boston: McGraw-Hill, 2001.
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