Niehaus, F. J. (2001). Karl's diary: Blessed Karl Leisner: in his own words. Schoenstatt Fathers.
Dyfyniad Arddull ChicagoNiehaus, Fr Jonathan. Karl's Diary: Blessed Karl Leisner: In His Own Words. Waukesha, WI: Schoenstatt Fathers, 2001.
Dyfyniad MLANiehaus, Fr Jonathan. Karl's Diary: Blessed Karl Leisner: In His Own Words. Schoenstatt Fathers, 2001.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.