A subject heading for books on the topic of teacher research (teachers studying their own teaching) is Action Research in Education.
Searching WorldCat Discovery for su:Action research in education will give you this results list.
The Wiley Handbook of Action Research in Education by 
The Palgrave International Handbook of Action Research by 
Leading with Passion and Knowledge by 
Toolkit for Action Research by 
Action Research in Special Education by 
Integrating Teaching, Learning, and Action Research by 
Learning from Young Children in the Classroom
What works? : a practical guide for teacher research by Library Hours
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