Vaughn, S. (2007). Twentieth century english. Anmol Publications Pvt. Ltd.
Trích dẫn kiểu ChicagoVaughn, Sharon. Twentieth Century English. Anmol Publications Pvt. Ltd, 2007.
MLA引文Vaughn, Sharon. Twentieth Century English. Anmol Publications Pvt. Ltd, 2007.
警告：这些引文格式不一定是100％准确.