Langan, J. (2001). English skills. Boson: McGraw-Hill.
Trích dẫn kiểu ChicagoLangan, John. English Skills. Boson: McGraw-Hill, 2001.
MLA引文Langan, John. English Skills. Boson: McGraw-Hill, 2001.
警告：這些引文格式不一定是100％准確.
APA引文
Langan, J. (2001). English skills. Boson: McGraw-Hill.
Trích dẫn kiểu ChicagoLangan, John. English Skills. Boson: McGraw-Hill, 2001.
MLA引文Langan, John. English Skills. Boson: McGraw-Hill, 2001.