Cita APA (7a ed.)

Hardy-Gould, J., & Styring, J. (2011). English plus: Workbook 4 (1a. ed.). Oxford University Press.

Cita Chicago Style (17a ed.)

Hardy-Gould, Janet, y James Styring. English Plus: Workbook 4. 1a. ed. Oxford: Oxford University Press, 2011.

Cita MLA (9a ed.)

Hardy-Gould, Janet, y James Styring. English Plus: Workbook 4. 1a. ed. Oxford University Press, 2011.