Cita APA

 Lightbown, P. (2013).  How languages are learned.  Oxford University Press.

Chicago Style Citation

 Lightbown, Patsy.  How Languages Are Learned.  Oxford University Press, 2013.

Cita MLA

 Lightbown, Patsy.  How Languages Are Learned.  Oxford University Press, 2013.

Atenció: Aquestes cites poden no estar 100% correctes.