Citazione Stile APA (7a Edizione)

Doughty, C., & Williams, J. (1998). Focus on form in classroom second language acquisition. Cambridge University Press.

Citazione stile Chigago Style (17a edizione)

Doughty, Catherine, e Jessica Williams. Focus on Form in Classroom Second Language Acquisition. Cambridge, [Eng.]: Cambridge University Press, 1998.

Citatione MLA (9a ed.)

Doughty, Catherine, e Jessica Williams. Focus on Form in Classroom Second Language Acquisition. Cambridge University Press, 1998.