Cita APA (7a ed.)

Kessler, J., & Keatinge, D. (2009). Research in second language acquisition: Empirical evidence across languages. Cambridge Scholars.

Cita Chicago Style (17a ed.)

Kessler, Jörg-U, y Dagmar Keatinge. Research in Second Language Acquisition: Empirical Evidence Across Languages. Newcastle upon Tyne: Cambridge Scholars, 2009.

Cita MLA (9a ed.)

Kessler, Jörg-U, y Dagmar Keatinge. Research in Second Language Acquisition: Empirical Evidence Across Languages. Cambridge Scholars, 2009.