APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (8. p.)

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