APA (7th ed.) Citation

Wardhaugh. (1999). An Introduction to sociolinguistics. Blackwell Publ.

Chicago Style (17th ed.) Citation

Wardhaugh. An Introduction to Sociolinguistics. Oxford: Blackwell Publ, 1999.

MLA (8th ed.) Citation

Wardhaugh. An Introduction to Sociolinguistics. Blackwell Publ, 1999.

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