Bibliography
Kruizinga, Samuël: Folkert Evert Posthuma 1874-1943. 'Heere God? Straf Posthuma' (Folkert Evert Posthuma 1874-1943. 'Lord God? Punish Posthema'), in: Klinkert, Wim / Kruizinga, Samuël / Moeyes, Paul (eds.): Nederland neutraal. De Eerste Wereldoorlog 1914-1918 (The neutral Netherlands. The First World War 1914-1918), Amsterdam 2014 Boom, pp. 225-280.
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