APA (7th ed.) Citation

Aitchison, J. (1991). Language change: Progress or decayn (2nd ed.). Cambridge University Press.

Chicago Style (17th ed.) Citation

Aitchison, Jean. Language Change: Progress or Decayn. 2nd ed. Cambridge, Eng: Cambridge University Press, 1991.

MLA (9th ed.) Citation

Aitchison, Jean. Language Change: Progress or Decayn. 2nd ed. Cambridge University Press, 1991.