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- Consortium for Policy Research Education (CPRE). (2011, January). Learning Trajectories in Mathematics. CPRE Research Report #RR-68. http://www.cpre.org/ccii/images/stories/ccii_pdfs/learning%20trajectories%20in%20math_ccii%20report.pdf (http://www.cpre.org/ccii/images/stories/ccii_pdfs/learning%20trajectories%20in%20math_ccii%20report.pdf)
- Foster , J. 1999 . Redesigning public education: The Kentucky experience , Lexington, KY : Diversified Services, Inc .