1. Beaumont, P. Trump threatens to cut aid to countries over UN Jerusalem Vote. “The Guardian” (December 2017). Web. 12 January 2018, https://www.theguardian.com/us-news/2017/dec/20/donald-trump-threat-cut-aid-un-jerusalem-vote
2. Bieńczyk-Missala, A. Poland’s foreign and security policy: main directions, “Revista UNISCI / UNISCI Journal”, no. 40 (Enero / January 2016), pp. 101–117.
3. Burleigh, N. Trump speaks at fourth-grade level, lowest of last 15 US presidents. “Newsweek”. Web. 1 August, 2018, https://www.newsweek.com/trump-fire-and-fury-smart-genius-obama-774169
4. Departament Stanu USA znów mówi o ustawie o IPN ‘Obawiamy się o relacje Polski z innymi krajami’. Gazeta.pl. (2.02.2018). Web. 8 February 2018, http://wiadomosci.gazeta.pl/wiadomosci/7,114884,22972416,departament-stanu-usaznow-mowi-o-ustawie-o-ipn-obawiamy-sie.html.
5. Dybczyński, A. Sojusze międzynarodowe. Warsaw: Scholar, 2014.