@inbook {Sommer 1980, title = {Predigt zur Vesper in der Kart{\"a}userkirche K{\"o}ln}, booktitle = {Hermann Josef Roth (ed.), Geschichte und Kultur der Kart{\"a}user. Tagung am 21. und 22. Oktober 1979 in K{\"o}ln}, series = {Cistercienser Chronik}, number = {87:1}, year = {1980}, note = {Elektronisch raadpleegbaar.}, pages = {40-42}, address = {Bregenz}, keywords = {K{\"o}ln O.Cart. (officium ad vesperas), liturgia, officia}, author = {Sommer , Rainer} }