1.
Linguistics. Harmondsworth: Penguin Books; 1971.
Linguistics. Harmondsworth : Penguin Books, 7 mai 1971. ISBN 0140213325
Crystal David. (1971). Linguistics. Penguin Books.
MLA (8th ed.) CitationCrystal David. Linguistics. Penguin Books, 1971.
Warning: These citations may not always be 100% accurate.