O r z e l l Laurence J.
Rome and the Validity of Orders in the Polish National Catholic Church, Scranton Pa. 1977, ss. 49.
A Minority within a Minority: The Polish National Catholic Church 1896-1907, Polish American Studies 36 (1979), s. 5-32.
Franciszek Hodur and the Old Catholics 1899-1908, PNCC Studies l (1980), s. 13-22.
Curious Allies: Bishop Antoni Kozlowski and the Episcopalians, Polish American Studies 40 (1983), s. 36-58.
Variations on an Old Catholic Theme: The Polish National Catholic Church, w: Gordon Huelin (wyd.), Old Catholics and Anglicans 1931-1981, Oxford 1983, s. 40-61.
Pragmatic Union. Bishop Kozlowski and the Old Catholics, Polish American Studies 44 (1987), s. 5-24.
Polish National Catholic - Episcopal Relations: Some Historical Obsewations, IKZ 82 (1992), s. 166-194.
Polish National Catholic - Roman Catholic Dialogue: Reunion or Rapprochement, IKZ 82 (1992), s. 182-194.