APA-ийн эшлэл(7 дахь хэвлэлт)

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

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

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

MLA -ийн эшлэл (9 дэх хэвлэлт)

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