Cita APA (7a ed.)
O'Connell, S. (1993). Focus on Advanced English. Nelson ELT.
Cita Chicago Style (17a ed.)
O'Connell, Sue. Focus on Advanced English. London: Nelson ELT, 1993.
Cita MLA (9a ed.)
O'Connell, Sue. Focus on Advanced English. Nelson ELT, 1993.
Precaución: Estas citas no son 100% exactas.