APA (7th ed.) Citation

Barker, A. L., & Knapp, K. A. (1987). Work out chemistry GCSE (2nd ed.). Macmillan.

Chicago Style (17th ed.) Citation

Barker, Alan L., and Katheryn A. Knapp. Work Out Chemistry GCSE. 2nd ed. Basingstoke: Macmillan, 1987.

MLA (9th ed.) Citation

Barker, Alan L., and Katheryn A. Knapp. Work Out Chemistry GCSE. 2nd ed. Macmillan, 1987.