Langan, J. (2006). English skills with readings. Boston: McGraw - Hill.
Trích dẫn kiểu ChicagoLangan, John. English Skills With Readings. Boston: McGraw - Hill, 2006.
MLA引文Langan, John. English Skills With Readings. Boston: McGraw - Hill, 2006.
警告：這些引文格式不一定是100％准確.