
Here is the link: https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0ahUKEwi9ubHRo-fYAhUpqVQKHfJGBW0QFggsMAE&url=http%3A%2F%2Fwww.slashfilm.com%2Fjoe-johnston-retiring-after-the-chronicles-of-narnia-the-silver-chair%2F&usg=AOvVaw1QC1mH17JwIXLmGETJHXTc
I also found this article by SCREENRANT.com as well. It confirms this story as well. https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&cad=rja&uact=8&ved=0ahUKEwi9ubHRo-fYAhUpqVQKHfJGBW0QFgg4MAM&url=https%3A%2F%2Fscreenrant.com%2Fjoe-johnston-retire-silver-chair-narnia%2F&usg=AOvVaw0WVcuaOO-q6M_kd-6EFwmx