Citazione Stile APA (7a Edizione)

Douglas, E. S., Girimonti, S., & Samuel, J. (2019). C1 train up your skills: Extensive English skills practice. Editorial Tébar Flores.

Citazione stile Chigago Style (17a edizione)

Douglas, Elisabeth S., Silvia Girimonti, e Julia Samuel. C1 Train Up Your Skills: Extensive English Skills Practice. Madrid: Editorial Tébar Flores, 2019.

Citatione MLA (9a ed.)

Douglas, Elisabeth S., et al. C1 Train Up Your Skills: Extensive English Skills Practice. Editorial Tébar Flores, 2019.