Cita APA (7a ed.)
Elsworth, S. (1989). Supplementary Grammar Exercises 1 (3.impression.). Longman Group UK.
Cita Chicago Style (17a ed.)
Elsworth, Steve. Supplementary Grammar Exercises 1. 3.impression. Harlow: Longman Group UK, 1989.
Cita MLA (9a ed.)
Elsworth, Steve. Supplementary Grammar Exercises 1. 3.impression. Longman Group UK, 1989.
Precaución: Estas citas no son 100% exactas.