Fraternità sacerdotale San Pio X, WWW Home page, Aug. 12, 2004 (Fraternità sacerdotale San Pio X, Fraternità sacerdotale S. Pio X, Frat. sac. S. Pio X, Frat. sac. San Pio X)
FSSPX WWW site, Oct. 7, 2009 English homepage (Priestly Society of Saint Pius X; Society of Saint Pius X) German homepage (Priesterbruderschaft St. Pius X.; FSSPX) French homepage (Fraternité sacerdotale Saint Pie X)
Most asked questions about the Society of Saint Pius X, c1997 t.p. (Society of Saint Pius X)
Rapporto sulla tradizione, 2007 cover (Fraternità Sacerdotale San Pio X)
Schifferle, A. Die Pius-Bruderschaft, c2009.
Society of St. Pius X, District of Asia WWW Home page, June 24, 2002 (SSPX)
Steinhart, F. Das gnadenreiche Prager Jesulein, 1988 t.p. (Priesterbruderschaft St. Pius X)