Alexander L. G. (2001). Longman English Grammar (18-ed.). Harlow, Pearson Education, 2001.
Cita Chicago Style (17a ed.)Alexander L. G. Longman English Grammar. 18-ed. Harlow, Pearson Education, 2001, 2001.
Cita MLA (9a ed.)Alexander L. G. Longman English Grammar. 18-ed. Harlow, Pearson Education, 2001, 2001.
Precaución: Estas citas no son 100% exactas.