APA引文

Hughes, J., & Stephenson, H. (2015). Life A1-A2: Student's book with online workbook. Singapore: National Geographic Learning.

Trích dẫn kiểu Chicago

Hughes, John, và Helen Stephenson. Life A1-A2: Student's Book With Online Workbook. Singapore: National Geographic Learning, 2015.

MLA引文

Hughes, John, và Helen Stephenson. Life A1-A2: Student's Book With Online Workbook. Singapore: National Geographic Learning, 2015.