Friedrich, V., Haupt, D., & Hoffmann, R. (2011). Starter: CLIL activity book for beginners ; geography, history, sciences (Druck A 1.). Westermann.
Citazione stile Chigago Style (17a edizione)Friedrich, Volker, Dieter Haupt, e Reinhard Hoffmann. Starter: CLIL Activity Book for Beginners ; Geography, History, Sciences. Druck A 1. Braunschweig: Westermann, 2011.
Citatione MLA (9a ed.)Friedrich, Volker, et al. Starter: CLIL Activity Book for Beginners ; Geography, History, Sciences. Druck A 1. Westermann, 2011.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.