Sayer, M., Dellar, H., & Walkley, A. (2016). Outcomes. Upper Intermediate: Teacher's Book Class Audio (segunda edición.). National Geographic Learning.
Citazione stile Chigago Style (17a edizione)Sayer, Mike, Hugh Dellar, e Andrew Walkley. Outcomes. Upper Intermediate: Teacher's Book Class Audio. segunda edición. Hampshire: National Geographic Learning, 2016.
Citatione MLA (9a ed.)Sayer, Mike, et al. Outcomes. Upper Intermediate: Teacher's Book Class Audio. segunda edición. National Geographic Learning, 2016.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.