Cita APA (7th ed.)

Longman. (2002). Language Activator: Helps You Write And Speak Natural English (2nd.). Pearson.

Cita Chicago (17th ed.)

Longman. Language Activator: Helps You Write And Speak Natural English. 2nd. Delhi: Pearson, 2002.

Cita MLA (9th ed.)

Longman. Language Activator: Helps You Write And Speak Natural English. 2nd. Pearson, 2002.