APA (7th ed.) Citation

Earl, B., & Wilford, L. D. R. (1995). GCSE chemistry. John Murray.

Chicago Style (17th ed.) Citation

Earl, B., and L. D. R. Wilford. GCSE Chemistry. London: John Murray, 1995.

MLA (9th ed.) Citation

Earl, B., and L. D. R. Wilford. GCSE Chemistry. John Murray, 1995.