For the definitive biography of Kandel, see J. Wesley Null, Peerless Educator: The Life and Work of Isaac Leon Kandel (New York Peter Lang, 2007).
For an anthology that includes many of Kandel's published writings, see J. Wesley Null and Diane Ravitch, Forgotten Heroes of American Education: The Great Tradition of Teaching Teachers (Greenwich, CT: Information Age Publishing, 2006).