Cita APA (7th ed.)

Longman. (1993). Language activator: The world's first production dictionary. Longman.

Cita Chicago (17th ed.)

Longman. Language Activator: The World's First Production Dictionary. Essex: Longman, 1993.

Cita MLA (9th ed.)

Longman. Language Activator: The World's First Production Dictionary. Longman, 1993.