Cita APA (7a ed.)

Alexander, L. G. (1990). Longman English grammar practice: For intermediate students. Longman.

Cita Chicago Style (17a ed.)

Alexander, L. G. Longman English Grammar Practice: For Intermediate Students. Harlow: Longman, 1990.

Cita MLA (9a ed.)

Alexander, L. G. Longman English Grammar Practice: For Intermediate Students. Longman, 1990.