Gaya APA

Lightbown, P, M., Spada, N. (2003). How languages are learned (Ed.2). New Yor: PT.ELEX MEDIA KOMPUTINDO.

Gaya MLA

Lightbown, Patsy, M.., Spada, Nina. "How languages are learned". Ed.2 New Yor: PT.ELEX MEDIA KOMPUTINDO, 2003. Text.