Cita APA (7a ed.)

Ellis, R. (1991). Understanding second language acquisition (1st published, 7th impression.). Oxford University Press.

Cita Chicago Style (17a ed.)

Ellis, Rod. Understanding Second Language Acquisition. 1st published, 7th impression. Oxford: Oxford University Press, 1991.

Cita MLA (9a ed.)

Ellis, Rod. Understanding Second Language Acquisition. 1st published, 7th impression. Oxford University Press, 1991.