Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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