Fraternidade Sacerdotal de São Pio X (Portuguese Wikipedia)

«SSPX Marriages not only Valid, but Incontestable». FSSPX.Actualités / FSSPX.News (em inglês). 11 de abril de 2017. Consultado em 24 de junho de 2021

fsspx.org

«Peregrinação a Roma e o combate doutrinal». General House. 29 de janeiro de 2016. Consultado em 24 de junho de 2021
«Our seminaries». General House (em inglês). Consultado em 24 de junho de 2021

According to an article on The Remnant (newspaper), Bishop Fellay cited as evidence replies of the Holy See to SSPX priests regarding absolution from reserved sins, which in fact, since 1983, no longer exist, and the fact that SSPX priests are allowed, after reconciliation, to function as priests, as are, for instance, eastern Christian priests received into the full communion of the Catholic Church.

According to an article on The Remnant (newspaper), Bishop Fellay cited as evidence replies of the Holy See to SSPX priests regarding absolution from reserved sins, which in fact, since 1983, no longer exist, and the fact that SSPX priests are allowed, after reconciliation, to function as priests, as are, for instance, eastern Christian priests received into the full communion of the Catholic Church.

«SSPX». SSPX website (em inglês). Consultado em 20 de novembro de 2023
[James Martin, "The Anti-Semitism of the Society of St. Pius X" in America review, 31 January 2009]; cf. John Vennari, "Judaism & the Church: before & after Vatican II"

«Código de Direito Canónico» (PDF). Santa Sé. p. 229. Cópia arquivada (PDF) em 21 de abril de 2015
"The fact that the Society of Saint Pius X does not possess a canonical status in the Church is not, in the end, based on disciplinary but on doctrinal reasons. As long as the Society (of St Pius X) does not have a canonical status in the Church, its ministers do not exercise legitimate ministries in the Church" (Pope Benedict XVI, Letter of 10 March 2009 to the Bishops of the Catholic Church concerning the remission of the excommunication of the four bishops consecrated by Archbishop Lefebvre).