Foster, Michael Smith (1999). Annulment. Paulist Press. էջ 83. ISBN9780809138449. «The Catholic Church considers marriages of baptized Protestants to be valid marriages. So if two Lutherans marry in the Lutheran Church in the presence of a Lutheran minister, the Catholic Church recognizes this as a valid sacrament of marriage.»
«Are non-Catholic marriages valid in the eyes of the Catholic Church? What if a Catholic marries a non-Catholic?». Catholic Answers. 1996. Արխիվացված է օրիգինալից 2013 թ․ դեկտեմբերի 21-ին. Վերցված է 2015 թ․ հունիսի 16-ին. «Supernatural marriages exist only between baptized people, so marriages between two Jews or two Muslims are only natural marriages. Assuming no impediments, marriages between Jews or Muslims would be valid natural marriages. Marriages between two Protestants or two Eastern Orthodox also would be valid, presuming no impediments, but these would be supernatural (sacramental) marriages and thus indissoluble.»
Survey of the American Rabbinate, The Jewish Outreach Institute, «The Jewish Outreach Institute». Արխիվացված է օրիգինալից 2009 թ․ սեպտեմբերի 3-ին. Վերցված է 2009 թ․ նոյեմբերի 17-ին. (retrieved 6 May 2009)
Summary of Rabbinic Center for Research and Counseling 2003 Survey, Irwin H. Fishbein, Rabbi, D. Min., Rabbinic Center for Research and Counseling, [1] (retrieved 6 May 2009)
«Are non-Catholic marriages valid in the eyes of the Catholic Church? What if a Catholic marries a non-Catholic?». Catholic Answers. 1996. Արխիվացված է օրիգինալից 2013 թ․ դեկտեմբերի 21-ին. Վերցված է 2015 թ․ հունիսի 16-ին. «Supernatural marriages exist only between baptized people, so marriages between two Jews or two Muslims are only natural marriages. Assuming no impediments, marriages between Jews or Muslims would be valid natural marriages. Marriages between two Protestants or two Eastern Orthodox also would be valid, presuming no impediments, but these would be supernatural (sacramental) marriages and thus indissoluble.»
Survey of the American Rabbinate, The Jewish Outreach Institute, «The Jewish Outreach Institute». Արխիվացված է օրիգինալից 2009 թ․ սեպտեմբերի 3-ին. Վերցված է 2009 թ․ նոյեմբերի 17-ին. (retrieved 6 May 2009)