APA (7th ed.) Citation

Trudgill, P. (1985). Sociolinguistics: An introduction to language and society (Revised ed., repr.). Penguin Books.

Chicago Style (17th ed.) Citation

Trudgill, Peter. Sociolinguistics: An Introduction to Language and Society. Revised ed., repr. Middlesex [etc.]: Penguin Books, 1985.

MLA (9th ed.) Citation

Trudgill, Peter. Sociolinguistics: An Introduction to Language and Society. Revised ed., repr. Penguin Books, 1985.