APA (7th ed.) Citation

Graham, D., Graham, C., & Whitcombe. (1996). A level mathematics a (1a ed.). Letts Educational.

Chicago Style (17th ed.) Citation

Graham, Duncan, Christine Graham, and Whitcombe. A Level Mathematics a. 1a ed. London: Letts Educational, 1996.

MLA (9th ed.) Citation

Graham, Duncan, et al. A Level Mathematics a. 1a ed. Letts Educational, 1996.