Longman. (2002). Language Activator: Helps You Write And Speak Natural English (2nd.). Pearson.
Citazione stile Chigago Style (17a edizione)Longman. Language Activator: Helps You Write And Speak Natural English. 2nd. Delhi: Pearson, 2002.
Citatione MLA (9a ed.)Longman. Language Activator: Helps You Write And Speak Natural English. 2nd. Pearson, 2002.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.