"His dissertation, A History of European Peace Societies, 1867-1899, won the Charles Sumner Peace Prize and, although it was never published, it has been called 'the most quoted unpublished dissertation in history'.
Jeho disertace, A History of European Peace Societies, 1867-1899, vyhrála Charles Sumner Peace Prize, a přestože nebyla nikdy zveřejněna, je nazývána nejvíce citovanou nepublikovanou disertací v historii.