English Website of St. Severin's Abbey in Germany:
http://www.abtei-st-severin.de/english

English Website of the Order of Port Royal: http://www.abtei-st-severin.de/english/port_royal_en.html

German Website of the Order of Port Royal: http://www.abtei-st-severin.de/port_royal.html

English Website of the American Priory of the Order of Port Royal: http://www.orderofportroyal.org