1. Adams, Joseph (1956). Clemens Brentano Emmerick-Erlebnis: Bindung und Abenteuer, Verlag Herder.
2. Berger, Peter L. (2011). The Sacred Canopy: Elements of a Sociological Theory of Religion, Open Road Media.
3. Berlin, Isaiah (1999). The Roots of Romanticism: The A. W. Mellon Lectures in the Fine Arts The National Gallery of Art, Washington, DC, Princeton University Press.
4. Progress and Piety: Liberalism, Catholicism and the State in Imperial Germany;Blackbourn;History Workshop Journal,1988
5. Blackbourn, David (1998). Marpingen: Apparitions of the Virgin Mary in Nineteenth-Century Germany, Oxford University Press.