APA-Zitierstil (7. Ausg.)

Isol. (2009). It's useful to have a duck: It's useful to have a boy (2nd print.). Groundwood Books.

Chicago-Zitierstil (17. Ausg.)

Isol. It's Useful to Have a Duck: It's Useful to Have a Boy. 2nd print. Toronto [u.a.]: Groundwood Books, 2009.

MLA-Zitierstil (9. Ausg.)

Isol. It's Useful to Have a Duck: It's Useful to Have a Boy. 2nd print. Groundwood Books, 2009.