एपीए उद्धरण

(2001). Delta's key to the TOEFL @ test. Delta Publishing Company.

शिकागो स्टाइल उद्धरण

Delta's Key to the TOEFL @ Test. Delta Publishing Company, 2001.

एमएलए उद्धरण

Delta's Key to the TOEFL @ Test. Delta Publishing Company, 2001.