Zum Recht der allgemeinen Geschäftsbedingungen im 19. Jahrhundert / Robert Pohlhausen. - Pohlhausen, Robert. (OLS)http://pul/name/66587 (Gremer, 1978)
Bibliografia: p. 191-204.

An introduction to the history of the Institute of the brothers of the Christian schools : 19th-20th century (1875-1928) / Henri Bédel ; english translation by br. Allen Jerzy Geppert. - Bédel, Henri, F.S.C. (OLS)http://pul/name/23133; Geppert, Allen, F.S.C. (OLS)http://pul/name/23134 (Brothers of the Christian Schools, 2008)
Bibliografia: p. 291-294.