Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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