Cita APA (7a ed.)

Jones, M., & Kerr, P. (2005). Straightforward: Pre-intermediate workbook with key. Macmillan Education.

Cita Chicago Style (17a ed.)

Jones, Matthew, y Philip Kerr. Straightforward: Pre-intermediate Workbook with Key. Oxford: Macmillan Education, 2005.

Cita MLA (9a ed.)

Jones, Matthew, y Philip Kerr. Straightforward: Pre-intermediate Workbook with Key. Macmillan Education, 2005.