Cita APA (7a ed.)

Plaut, J. A key to listen and speak: A natural way to english: Volume 2. Imprenta de carabineros.

Cita Chicago Style (17a ed.)

Plaut, Julio. A Key to Listen and Speak: A Natural Way to English: Volume 2. Santiago: Imprenta de carabineros.

Cita MLA (9a ed.)

Plaut, Julio. A Key to Listen and Speak: A Natural Way to English: Volume 2. Imprenta de carabineros.