Lightbown, P. M., & Spada, N. (1993). How languages are learned. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Lightbown, Patsy M., agus Nina Spada. How Languages Are Learned. Oxford: Oxford University Press, 1993.
Lua MLA (9ú heag.)Lightbown, Patsy M., agus Nina Spada. How Languages Are Learned. Oxford University Press, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.