Dummett, P., Hughes, J., & Stephenson, H. Life: Pre- intermediate student's book with online workbook. Singapore.
Trích dẫn kiểu ChicagoDummett, Paul, John Hughes, và Helen Stephenson. Life: Pre- Intermediate Student's Book With Online Workbook. Singapore.
MLA引文Dummett, Paul, John Hughes, và Helen Stephenson. Life: Pre- Intermediate Student's Book With Online Workbook. Singapore.
警告：这些引文格式不一定是100％准确.