(en) Allison Quinn, « Poroshenko ally Hrytsak quietly takes over SBU », Kyiv Post, (lire en ligne)
president.gov.ua
(en) « President introduced Acting Head of the Security Service of Ukraine Hrytsak: We must achieve new social attitude to the Security Service », president.gov.ua, (lire en ligne)
uatoday.tv
(en) « Ukrainian lawmakers appoint new Security Service chief », Ukraine Today, (lire en ligne)