Principles of linguistic change. 1 : Internal factors

MLA

Labov, William. Principles of Linguistic Change. 1 : Internal Factors. Oxford: Blackwell, 1994.

APA

Labov, W. (1994). Principles of linguistic change. 1 : Internal factors. Oxford: Blackwell.

Chicago

Labov, William, Principles of Linguistic Change. 1 : Internal Factors. Oxford: Blackwell, 1994.