The Immaculate Conception
Article by Wade L.J. Menezes, in the November/December 2000 issue of Catholic Faith.

Memorandum on the Immaculate Conception
By John Henry Cardinal Newman.

Ad Diem Illum Laetissimum
Encyclical of Pope St. Pius X, issued to mark the fiftieth anniversary of the proclamation of the Immaculate Conception as a dogma. Promulgated 2 February, 1904.

The Immaculate Conception
Article by Rev Charles Dickson published in The Catholic Answer.

IQB: Aquinas and the Immaculate Conception
James Akin's explanation of Thomas Aquinas' views on the issue of Mary's sinlessness.

Ineffabilis Deus
Defines the Immaculate Conception infallibly as dogma. Apostolic Constitution issued by Pope Pius IX on 8 December, 1854.