Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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