A very abbreviated biography of Walt Disney, only 32 pages in length. This book is suitable for kids age 4 and up. An interesting book is available for young adults called, "Walt Disney: Young Movie Maker". It tells the story of what Walt's life was like as a child.
For an adult bio on his life, check the book by Bob Thomas. Another intersting book by Amy Booth focuses on other people's persoanl stories and memories of Walt.