1. AICPA, American Institute of Certified Public Accountants. Retrieved June, 20 2015 from www.cpa-exam.org.
2. ASCP, the Board of Certification. Retrieved June, 20 2015 from www.ascp.org/Board-of-Certification/International/Certification/Step-6/ComputerAdaptiveTestingCAT.html.
3. ASVAB, the Armed Services Vocational Aptitude Battery. Retrieved June, 20 2015 from http://www.official-asvab.com/catasvab_app.htm.
4. The basics of item response theory, estimating an examinee's Ability;Baker,2001
5. Feasibility of a programmed testing machine (U.S. Army personnel research office research study 6403);Bayroff,1964