Cita APA

Hopkins, D., & Cullen, P. (2007). Cambridge grammar for IELTS: Grammar reference and practice. New York: Cambridge University Press.

Chicago Style Citation

Hopkins, Diana, i Pauline Cullen. Cambridge Grammar for IELTS: Grammar Reference and Practice. New York: Cambridge University Press, 2007.

Cita MLA

Hopkins, Diana, i Pauline Cullen. Cambridge Grammar for IELTS: Grammar Reference and Practice. New York: Cambridge University Press, 2007.