Cita APA (7a ed.)

Barker, D., Broadbent, C., & Harris, H. (2021). Geography (OCR A level, third edition.). Hodder Education.

Cita Chicago Style (17a ed.)

Barker, David, Chris Broadbent, y Helen Harris. Geography. OCR A level, third edition. London: Hodder Education, 2021.

Cita MLA (9a ed.)

Barker, David, et al. Geography. OCR A level, third edition. Hodder Education, 2021.