APA Style

Labov, William. (1994). Principles of linguistic change vol.1: internal factors . Oxford: Wiley-Blackwell.

Chicago Style

Labov, William. Principles of linguistic change vol.1: internal factors. Oxford: Wiley-Blackwell, 1994. Text.

MLA Style

Labov, William. Principles of linguistic change vol.1: internal factors. Oxford: Wiley-Blackwell, 1994. Text.

Turabian Style

Labov, William. Principles of linguistic change vol.1: internal factors. Oxford: Wiley-Blackwell, 1994. Print.