Cita APA (7a ed.)

Hopwood, T., & Rushton, L. (1990). Integrated skills: Advanced. Heinemann.

Cita Chicago Style (17a ed.)

Hopwood, Tony, y Lynne Rushton. Integrated Skills: Advanced. Oxford: Heinemann, 1990.

Cita MLA (8a ed.)

Hopwood, Tony, y Lynne Rushton. Integrated Skills: Advanced. Heinemann, 1990.