APA (7th ed.) Zitazioa

Preston, D. R. (1989). Sociolinguistics and second language acquistion. Basil Blackwell.

Chicago Style (17th ed.) Zitazioa

Preston, Dennis R. Sociolinguistics and Second Language Acquistion. Oxford: Basil Blackwell, 1989.

MLA (9th ed.) Zitazioa

Preston, Dennis R. Sociolinguistics and Second Language Acquistion. Basil Blackwell, 1989.