Books Horn, I.S. & Garner, B. (2022) Teacher Learning of Ambitious and Equitable Mathematics Instruction: A Sociocultural Approach by Ilana Horn & Brette Garner Routledge Horn, I.S. (2017) Motivated: Designing Math Classrooms Where Students Want to Join In Heinemann Horn, I.S. (2012) Strength in Numbers: Collaborative Learning in Secondary Mathematics National Council of Teachers of Mathematics