APA (7th ed.) Citation

Butler, R., & Kerr, E. (1966). An introduction to numerical methods. Pitman.

Chicago Style (17th ed.) Citation

Butler, Ronald, and Edwin Kerr. An Introduction to Numerical Methods. London: Pitman, 1966.

MLA (9th ed.) Citation

Butler, Ronald, and Edwin Kerr. An Introduction to Numerical Methods. Pitman, 1966.