MLA

Chambers, J. K, and Peter Trudgill. Dialectology. 2nd ed. Cambridge: Cambridge university press, 1998.

APA

Chambers, J. K, & Trudgill, P. (1998). Dialectology. 2nd ed. Cambridge: Cambridge university press.

Chicago

Chambers, J. K., and Peter Trudgill. Dialectology. 2nd ed. Cambridge: Cambridge university press, 1998.