1. Arnold, John-Michael. 2016. NATO’s Readiness Action Plan Strategic Benefits and Outstanding Challenges. Strategic Studies Quarterly 10 (1): 74–105.
2. Bashirov, Galib, and Ihsan Yilmaz. 2019. The Rise of Transactionalism in International Relations: Evidence from Turkey’s Relations with the European Union. Australian Journal of International Affairs 74 (2): 1–20.
3. Béraud-Sudreau, Lucie, and Bastian Giegerich. 2018. NATO Defence Spending and European Threat Perceptions. Survival 60 (4): 53–74.
4. Biscop, Sven. 2019. EU-U.S. Consensus and NATO-EU Cooperation. In New Perspectives on Shared Security: NATO’s Next 70 Years, ed. Tomáš Valášek, 15–18. Carnegie Endowment for International Peace. https://carnegieendowment.org/files/NATO_int_final1.pdf. Accessed 4 April 2021.
5. Biden, Joseph. 2021a. Remarks by President Biden on America’s Place in the World. Speech by President Joseph Biden, 4 February 2021. https://www.whitehouse.gov/briefing-room/speeches-remarks/2021/02/04/remarks-by-president-biden-on-americas-place-in-the-world/. Accessed 19 May 2021.