https://www.proprofs.com/quiz-school/story.php?title=5000-year-leap-1st-principle
https://www.proprofs.com/quiz-school/story.php?title=5000-year-leap-part-1
http://www.kingwoodteaparty.com/wp-content/uploads/pdf_5000yl_StudyGuide-f.pdf
https://dougdelp.files.wordpress.com/2011/09/5000-year-leap-lesson-intro-rulers-law-vs-peoples-law-1.pdf
