APA

Lightbown P. M., Sapada N., . (2006). How languages are learned. : Oxford university press.

Chicago

Lightbown Patsy M, Sapada Nina, . 2006. How languages are learned. : Oxford university press.

Harvard

Lightbown P. M., Sapada N., . (2006). How languages are learned. : Oxford university press.

MLA

Lightbown Patsy M, Sapada Nina, . How languages are learned. : Oxford university press. 2006.