APA (7 वां संस्करण) प्रशस्ति पत्र

BALLARD, C. (2001). HOW DO WE THINK (1st.). HODDER CHILDREN'S BOOKS.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

BALLARD, CAROL. HOW DO WE THINK. 1st. LONDON: HODDER CHILDREN'S BOOKS, 2001.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

BALLARD, CAROL. HOW DO WE THINK. 1st. HODDER CHILDREN'S BOOKS, 2001.