Barker, A. L., & Knapp, K. A. (1987). Work out chemistry GCSE (2nd ed.). Macmillan.
Chicago Style (17th ed.) CitationBarker, Alan L., and Katheryn A. Knapp. Work Out Chemistry GCSE. 2nd ed. Basingstoke: Macmillan, 1987.
MLA (9th ed.) CitationBarker, Alan L., and Katheryn A. Knapp. Work Out Chemistry GCSE. 2nd ed. Macmillan, 1987.
Warning: These citations may not always be 100% accurate.