APA (7th ed.) Zitazioa

Hughes, J. (2014). Life: Elementary. Workbook (1a. ed.). National Geographic Learning.

Chicago Style (17th ed.) Zitazioa

Hughes, John. Life: Elementary. Workbook. 1a. ed. Hampshire: National Geographic Learning, 2014.

MLA (9th ed.) Zitazioa

Hughes, John. Life: Elementary. Workbook. 1a. ed. National Geographic Learning, 2014.