APA (7th ed.) Citation

Trudgill, P. (1974). Sociolinguistics : an introduction / (by) Peter Trudgill: An introduction. Penguin.

Chicago Style (17th ed.) Citation

Trudgill, Peter. Sociolinguistics : An Introduction / (by) Peter Trudgill: An Introduction. Harmondsworth (etc.): Penguin, 1974.

MLA (9th ed.) Citation

Trudgill, Peter. Sociolinguistics : An Introduction / (by) Peter Trudgill: An Introduction. Penguin, 1974.

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