References

  1. http://www.schlage.com/en/home/support/understand-product-options/functions-grades.html
  2. https://www.ansi.org/about_ansi/overview/overview.aspx?menuid=1
  3. https://www.redbeacon.com/hg/how-many-deadbolts-does-my-door-need/
  4. http://www.doityourself.com/stry/9-tips-for-selecting-a-deadbolt-lock#b
  5. http://www.ncpc.org/resources/files/pdf/neighborhood-safety/locking-your-home-reva-1-pdf.pdf
  6. http://www.safeguardtheworld.com/statistics.html
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