APA
Trudgill P., . (1974). Sociolinguistics. England: Penguin Books.
Chicago
Trudgill Peter, . 1974. Sociolinguistics. England: Penguin Books.
Harvard
Trudgill P., . (1974). Sociolinguistics. England: Penguin Books.
MLA
Trudgill Peter, . Sociolinguistics. England: Penguin Books. 1974.