Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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