Mackey, A., & Gass, S. M. (2012). Research methods in second language acquisition: A practical guide. Wiley-Blackwell.
Chicago-čujuhus (17. p.)Mackey, Alison, juo Susan M. Gass. Research Methods in Second Language Acquisition: A Practical Guide. West Sussex, [Eng.]: Wiley-Blackwell, 2012.
MLA-čujuhus (9. p.)Mackey, Alison, juo Susan M. Gass. Research Methods in Second Language Acquisition: A Practical Guide. Wiley-Blackwell, 2012.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.