Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

Doughty, Catherine J., e Jessica Williams. Focus on Form in Classroom Second Language Acquisition. Nueva York: Cambridge University, 1998.

Citatione MLA (9a ed.)

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