Cita APA (7th ed.)

Lightbown, P. M., & Spada, N. (1993). How languages are learned. Oxford University.

Cita Chicago (17th ed.)

Lightbown, Patsy M., i Nina Spada. How Languages Are Learned. Oxford: Oxford University, 1993.

Cita MLA (9th ed.)

Lightbown, Patsy M., i Nina Spada. How Languages Are Learned. Oxford University, 1993.