Cita APA

Conrad, S., Biber, D., & Leech, G. N. (2002). Longman student grammar of spoken and written english: Workbook. London: Longman.

Citación estilo Chicago

Conrad, Susan, Douglas Biber, and Geoffrey N. Leech. Longman Student Grammar of Spoken and Written English: Workbook. London: Longman, 2002.

Cita MLA

Conrad, Susan, Douglas Biber, and Geoffrey N. Leech. Longman Student Grammar of Spoken and Written English: Workbook. London: Longman, 2002.