Behind Closed Doors: stories from the Kamloops Indian Residential School by 
What we learned : two generations reflect on Tsimshian education and the day schools by
I believe Helen Raptis is not indigenous but she has recorded members of the Tsimshian Nation.
Residential schools : with the words and images of survivors by 
Broken Circle by 
Spirit of the Grassroots People by 
Kuei, My Friend: a conversation on racism and reconciliation by Examples of subjects in the library catalogue:
Some introductory advice and example keyword searching:
residential schools
boarding schools
industrial schools
day schools
geographic location: Canada or specific province or region
Searching name of specific residential school here is a list of residential schools
residential schools and biography
intergenerational trauma
colonization and psychological aspects
Indigenous or Aboriginal
First Nations
Metis
Inuit
Sto:lo
Power Through Testimony by 
Legacy by 
21 things you may not know about the Indian Act by 
Racism, colonialism, and indigeneity in Canada : a reader by 