Παραπομπή APA

S Upendran. (2013). Know your English: Words frequently confused. Universities press.

Παραπομπή Chicago Style

S Upendran. Know Your English: Words Frequently Confused. Chennai: Universities press, 2013.

Παραπομπή MLA

S Upendran. Know Your English: Words Frequently Confused. Universities press, 2013.