References
From the College Board
The 9th Annual AP Report to the Nation
AP Report to the Nation: State Supplement, Iowa (February 13, 2013)
From the Iowa Department of Education
The Iowa Department of Education Education Statistics
Iowa Senior Year Plus program, Iowa Department of Education
Iowa Department of Education Condition of Education Report
From Other Sources
Geiser, S., & Santelices, V. (2004). The role of Advanced Placement and honors courses in college admissions (Paper CSHE-4-04). Berkeley, CA: UC Berkeley, Center for Studies in Higher Education.
Keng, L., & Dodd, B. G. (2008). A comparison of college performances of AP and Non-AP student groups in 10 subject areas (College Board Research Report No. 2008-7). New York, NY: The College Board.