Cita APA (7a ed.)
O'Connell, S. (1992). Focus on Advanced English C. A. E (1. Edition.). Nelson.
Cita Chicago Style (17a ed.)
O'Connell, Sue. Focus on Advanced English C. A. E. 1. Edition. London: Nelson, 1992.
Cita MLA (9a ed.)
O'Connell, Sue. Focus on Advanced English C. A. E. 1. Edition. Nelson, 1992.
Precaución: Estas citas no son 100% exactas.