Knut :
Hatkoff, Julianna et al
Knut : How One Little polar Bear Captivated the World. - New York : Scholastic Press, 2007.
978-0-545-04716-6
Polar Bears
Knut : How One Little polar Bear Captivated the World. - New York : Scholastic Press, 2007.
978-0-545-04716-6
Polar Bears