Παραπομπή σε μορφή APA (7η εκδ.)

Doughty, C., & Williams, J. Focus on form in classroom second language acquisition (2a ed.).

Παραπομπή σε μορφή Chicago (17η εκδ.)

Doughty, Catherine, και Jessica Williams. Focus on Form in Classroom Second Language Acquisition. 2a ed.

Παραπομπή σε μορφή MLA (8th εκδ.)

Doughty, Catherine, και Jessica Williams. Focus on Form in Classroom Second Language Acquisition. 2a ed.