http://cte.jhu.edu/techacademy/web/2000/integers/intintmain.htm

http://home.ubalt.edu/ntsbarsh/opre640A/partIII.htm

http://www.arcytech.org/java/integers/feedback.html

http://justholladay.110mb.com/Integers.htm

http://highered.mcgraw-hill.com/sites/007092242x/student_view0/get_ready_for_grade_912/integers_quiz.html
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