A review of Ringing The Changes, an autobiography by Mazo de la Roche, is online at the blog, Leaves And Pages.
There is a Mazo de la Roche Society that is "dedicated to providing a forum to revisit Mazo de la Roche, a prolific Canadian writer."
See The Mystery of Mazo de la Roche film clip here.
Another interesting blog post about Mazo can be found at Inkwell Inspirations.
A fire in 2014 at her Toronto home on Yorkville Avenue was mentioned here.
Mazo's FindAGrave memorial.