Douglas, E. S., Girimonti, S., & Samuel, J. (2019). C1 speaking skills: The five, themed modules give you non-stop speaking practice. Editorial Tébar Flores.
Lua i Stíl Chicago (17ú heag.)Douglas, Elisabeth S., Silvia Girimonti, agus Julia Samuel. C1 Speaking Skills: The Five, Themed Modules Give You Non-stop Speaking Practice. Madrid, España: Editorial Tébar Flores, 2019.
Lua MLA (9ú heag.)Douglas, Elisabeth S., et al. C1 Speaking Skills: The Five, Themed Modules Give You Non-stop Speaking Practice. Editorial Tébar Flores, 2019.
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