Cita APA (7a ed.)
Duckworth, M., & Gude, K. (1991). Success at First Certificate: Workbook. Oxford University Press.
Cita Chicago Style (17a ed.)
Duckworth, Michael, y Kathy Gude. Success at First Certificate: Workbook. Oxford: Oxford University Press, 1991.
Cita MLA (9a ed.)
Duckworth, Michael, y Kathy Gude. Success at First Certificate: Workbook. Oxford University Press, 1991.
Precaución: Estas citas no son 100% exactas.