Παραπομπή APA

Collins. (2013). Work on your grammar (Pre-Intermediate A2): Over 200 exercises to improve your English grammar. Tổng hợp.

Παραπομπή Chicago Style

Collins. Work On Your Grammar (Pre-Intermediate A2): Over 200 Exercises to Improve Your English Grammar. Tổng hợp, 2013.

Παραπομπή MLA

Collins. Work On Your Grammar (Pre-Intermediate A2): Over 200 Exercises to Improve Your English Grammar. Tổng hợp, 2013.

Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.