The light of nations : Evangelical renewal and advance in the Nineteenth Century - Orr, J. Edwin. (OLS)http://ftis/name/76347 (Paternoster Church History, 1965)

6: Altertum. - Schneider, Helmuth. (OLS)http://ftis/name/51991; Cancik, Hubert. (OLS)http://ftis/name/51990 (Neue Pauly, 1999)