Rohtmets, P. “Ecumenical Peace Organisation ‘The World Alliance for Promoting International Friendship through the churches’ and Resistance to Totalitarian Regimes Between Two World Wars”. Usuteaduslik Ajakiri, vol. 64, no. 1, Jan. 2013, pp. 62-83, https://ojs.utlib.ee/index.php/UA/article/view/23435.