Cita APA (7th ed.)

Biber, D., Johansson, S., Leech, G. N., Conrad, S., & Finegan, E. (1999). Longman grammar of spoken and written English. Pearson Education.

Cita Chicago (17th ed.)

Biber, Douglas, Stig Johansson, Geoffrey N. Leech, Susan Conrad, i Edward Finegan. Longman Grammar of Spoken and Written English. Londres: Pearson Education, 1999.

Cita MLA (9th ed.)

Biber, Douglas, et al. Longman Grammar of Spoken and Written English. Pearson Education, 1999.