^Ostermann, Falk; Mello, Patrick A. (2023). Routledge Handbook of Foreign Policy Analysis Methods. London/New York: Routledge. pp. xix–xx.
^Niemann, Holger; Schillinger, Henrik (2017). "Contestation 'all the way down'? The grammar of contestation in norm research". Review of International Studies. 43 (1): 31. doi:10.1017/S0260210516000188.
^Livingston, Alexander (2022). James Tully. To Think and Act Differently. London/New York: Routledge. pp. 151, n.10.