Cita APA (7th ed.)

Hughes, J. (2013). Life: Pre-Intermediate. Workbook (1a. ed.). National Geographic Learning.

Cita Chicago (17th ed.)

Hughes, John. Life: Pre-Intermediate. Workbook. 1a. ed. Hampshire: National Geographic Learning, 2013.

Cita MLA (9th ed.)

Hughes, John. Life: Pre-Intermediate. Workbook. 1a. ed. National Geographic Learning, 2013.