Cita APA (7a ed.)

Jacobs, A. (2009). In focus. Severn House.

Cita Chicago Style (17a ed.)

Jacobs, Anna. In Focus. Sutton, Surrey, England: Severn House, 2009.

Cita MLA (8a ed.)

Jacobs, Anna. In Focus. Severn House, 2009.

Precaución: Estas citas no son 100% exactas.