Roberts, R. (2004). IELTS foundation. Oxford: MacMillan Education.
Trích dẫn kiểu ChicagoRoberts, Rachael. IELTS Foundation. Oxford: MacMillan Education, 2004.
MLA引文Roberts, Rachael. IELTS Foundation. Oxford: MacMillan Education, 2004.
警告:这些引文格式不一定是100%准确.