Lightbown , P. M. (2015). How Languages are: Learned (4th ed.). OUP.
Chicago-čujuhus (17. p.)Lightbown , Patsy M. How Languages Are: Learned. 4th ed. UK: OUP, 2015.
MLA-čujuhus (9. p.)Lightbown , Patsy M. How Languages Are: Learned. 4th ed. OUP, 2015.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.