http://www.uxmatters.com/mt/archives/2011/06/effective-use-of-typography-in-applications-for-children-3.php
Effective Use of Typography in Applications for Children
http://www.uxmatters.com/mt/archives/2011/10/effective-use-of-color-and-graphics-in-applications-for-children-part-i-toddlers-and-preschoolers.php
Effective Use of Color and Graphics in Applications for Children, Part I: Toddlers and Preschoolers