Cita APA (7a ed.)
O'Connell, S. (1992). Focus on Advanced English. Teacher's Book. Thomas Nelson and Sons.
Cita Chicago Style (17a ed.)
O'Connell, Sue. Focus on Advanced English. Teacher's Book. London: Thomas Nelson and Sons, 1992.
Cita MLA (9a ed.)
O'Connell, Sue. Focus on Advanced English. Teacher's Book. Thomas Nelson and Sons, 1992.
Precaución: Estas citas no son 100% exactas.