APA (7th ed.) Citation

Center for Applied Linguistics, Shopen, T., & Williams, J. M. (1981). Style and variables in English. Winthrop.

Chicago Style (17th ed.) Citation

Center for Applied Linguistics, Timothy Shopen, and Joseph M. Williams. Style and Variables in English. Cambridge (Massachusetts): Winthrop, 1981.

MLA (9th ed.) Citation

Center for Applied Linguistics, et al. Style and Variables in English. Winthrop, 1981.