Langan, J. (2008). English Skills with Readings. McGraw - HillCompanies, Inc.
Trích dẫn kiểu ChicagoLangan, John. English Skills With Readings. McGraw - HillCompanies, Inc, 2008.
MLA引文Langan, John. English Skills With Readings. McGraw - HillCompanies, Inc, 2008.
警告：这些引文格式不一定是100％准确.