APA (7th ed.) Citation

Heard, T., & Martin, D. R. (1978). Extending mathematics: An 'A' level course in pure mathematics. Oxford University Press.

Chicago Style (17th ed.) Citation

Heard, Terry, and D. R. Martin. Extending Mathematics: An 'A' Level Course in Pure Mathematics. Oxford: Oxford University Press, 1978.

MLA (9th ed.) Citation

Heard, Terry, and D. R. Martin. Extending Mathematics: An 'A' Level Course in Pure Mathematics. Oxford University Press, 1978.

Warning: These citations may not always be 100% accurate.