Cita APA

Hughes, J., Dummett, P., & Stephenson, H. (2015). Life: Elementary. Student's Book with Online Workbook . A1 - A2 (Vietnam edtion.). Singapore: National Geographic Learning; Cengage Learning.

Chicago Style Citation

Hughes, John, Paul Dummett, i Helen Stephenson. Life: Elementary. Student's Book With Online Workbook . A1 - A2. Vietnam edtion. Singapore: National Geographic Learning; Cengage Learning, 2015.

Cita MLA

Hughes, John, Paul Dummett, i Helen Stephenson. Life: Elementary. Student's Book With Online Workbook . A1 - A2. Vietnam edtion. Singapore: National Geographic Learning; Cengage Learning, 2015.