APA (7th ed.) Citation

Labov, W. (2001). Principles of linguistic change / William Labov. Blackwell.

Chicago Style (17th ed.) Citation

Labov, William. Principles of Linguistic Change / William Labov. Oxford: Blackwell, 2001.

MLA (9th ed.) Citation

Labov, William. Principles of Linguistic Change / William Labov. Blackwell, 2001.

Warning: These citations may not always be 100% accurate.