Volker Krause, J. David Singer "Minor Powers, Alliances, And Armed Conflict: Some Preliminary Patterns", in "Small States and Alliances", 2001, pp 15-23, ISBN978-3-7908-2492-6 (Print) ISBN978-3-662-13000-1 (Online) [1]
tandfonline.com
Brett Leeds , Jeffrey Ritter, Sara Mitchell, Andrew Long, "Alliance Treaty Obligations and Provisions, 1815-1944", "International Interactions: Empirical and Theoretical Research in International Relations", 2002, vol. 28, issue 3, p. 237-260, DOI: 10.1080/03050620213653 [2]
