Hill, Heather C., and Deborah ball. "Leaning Mathematics for teaching: Results from California's mathematics Professional Development Institutes." Journal for Research in Mathematics Education 35, no. 5 (2004): 330-51.
Hill, Heather C., and Deborah ball."Leaning Mathematics for teaching: Results from California's mathematics Professional Development Institutes." Journal for Research in Mathematics Education 35, no. 5 (2004): 330-51.