Foreign Policy in the 20th Century (Volume I). Cambridge Scholars. ISBN 978-1-5275-4502-1. Karel Schelle, The First World War and the Paris Peace Agreement...
Foreign Policy in the 20th Century (Volume I). Cambridge Scholars. ISBN 9781527545021. Weltkrieg, Erster (31 December 2011). "Erster Weltkrieg". Historisches...