APA (7th ed.) Citation

Clemens, R., Crabbe, M., & Moule, L. (2009). OCR GCSE Geography - specification A (1st publ.). Heinemann.

Chicago Style (17th ed.) Citation

Clemens, Rob, Martin Crabbe, and Lesley Moule. OCR GCSE Geography - Specification A. 1st publ. Harlow: Heinemann, 2009.

MLA (9th ed.) Citation

Clemens, Rob, et al. OCR GCSE Geography - Specification A. 1st publ. Heinemann, 2009.