APA (7th ed.) Citation
Trudgill, P. (1983). Sociolinguistics: An introduction to language and society. Penguin Books.
Chicago Style (17th ed.) Citation
Trudgill, Peter. Sociolinguistics: An Introduction to Language and Society. London: Penguin Books, 1983.
MLA (9th ed.) Citation
Trudgill, Peter. Sociolinguistics: An Introduction to Language and Society. Penguin Books, 1983.
Warning: These citations may not always be 100% accurate.