Kondycja liberalnego ładu międzynarodowego: Mazarr, Michael J., Astrid Cevallos, Miranda Priebe, Andrew Radin, Kathleen Reedy, Alexander D. Rothenberg, Julia A. Thompson and Jordan Willcox. Measuring the Health of the Liberal International Order. Santa Monica, CA: RAND Corporation, 2017. https://www.rand.org/pubs/research_reports/RR1994.html.