APA (7th ed.) Citation

Richards, J. C., & Long, M. N. (1977). Breakthrough 1: A course in English communication practice. Oxford University Press.

Chicago Style (17th ed.) Citation

Richards, Jack C., and M. N. Long. Breakthrough 1: A Course in English Communication Practice. Oxford: Oxford University Press, 1977.

MLA (9th ed.) Citation

Richards, Jack C., and M. N. Long. Breakthrough 1: A Course in English Communication Practice. Oxford University Press, 1977.