Cita APA (7th ed.)

Conrad, S., & Biber, D. (2009). Real grammar: A corpus-based approach to English. Pearson Education.

Cita Chicago (17th ed.)

Conrad, Susan, i Douglas Biber. Real Grammar: A Corpus-based Approach to English. Nueva York: Pearson Education, 2009.

Cita MLA (9th ed.)

Conrad, Susan, i Douglas Biber. Real Grammar: A Corpus-based Approach to English. Pearson Education, 2009.