Cita APA (7a ed.)

(2006). Longman Language Activator. Helps you write and speak natural English (17th ed.). Harlow, Longman, 2006.

Cita Chicago Style (17a ed.)

Longman Language Activator. Helps You Write and Speak Natural English. 17th ed. Harlow, Longman, 2006, 2006.

Cita MLA (9a ed.)

Longman Language Activator. Helps You Write and Speak Natural English. 17th ed. Harlow, Longman, 2006, 2006.