Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (8a ed.)

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