Barker, V. (2008). English-only movements. The International Encyclopedia of Communication. Malden, MA: Blackwell Publishing Ltd.

Giles, H., Hajek, C., Barker, V., Anderson, M. C., Chen, M-L., Zhang, B.Y., & Hummert, M.L. (2007). Communicative dimensions of police-civilian interaction in cross-cultural context. In A. Weatherall, B. Watson, & Gallois, G. (Eds.), The social psychology of language and discourse (pp.313-159). Basingstoke, England: Palgrave Macmillan.

Giles, H., Fortman, J., Dailey, R., Barker, V., Hajek, C., & Anderson, M.C. (2006) Communication accommodation: Law enforcement and the public. In B. A. Le Poire & R. M. Dailey (Eds), Applied research in interpersonal communication: Family communication, health communication, and communicating across social boundaries. New York: Peter Lang.

Barker, V., Giles, H., & Harwood, J. (2004). Inter- and intragroup perspectives on intergenerational communication. In J. F. Nussbaum & J. Coupland (Eds.), Handbook of communication and aging (2nd. Ed.). Mahwah, NJ: LEA.