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https://sites.google.com/site/kalllitteratur/home/0/hvad-tror-katolikkerne/
Hvad tror katolikkerne?
af Otto Hermann Pesch
Niels Steensens Forlag, 1993
ISBN 87-87275-79-1
https://bibliotek.dk/eng/work/870970-basis%3A05146402
Originaludgaven (Topos-Taschenbuch):
(Kleines katholisches Glaubensbuch) ?
Matthias Grünewald-Verlag, Mainz, 1974
https://www.zvab.com/servlet/BookDetailsPL?bi=15527980682&searchurl=an%3DPESCH%252C%2BOTTO%2BHERMANN%2B%26hl%3Don%26sortby%3D20&cm_sp=snippet-_-srp1-_-title1