– https://www.icann.org/resources/pages/approved-with-specs-2013-09-17-en

– https://www.icann.org/resources/pages/errp-2013-02-28-en

– http://www.icann.org/en/registrars/registrant-rights-responsibilities-en.htm https://www.icann.org/resources/pages/registrars/consensus-policies-en

– http://www.iana.org/domains/root/db