APA (7th ed.) Citation

Allan, E., & Harris, J. (1991). Higher grade chemistry. Hodder & Stoughton.

Chicago Style (17th ed.) Citation

Allan, Eric, and John Harris. Higher Grade Chemistry. London: Hodder & Stoughton, 1991.

MLA (9th ed.) Citation

Allan, Eric, and John Harris. Higher Grade Chemistry. Hodder & Stoughton, 1991.