The Immaculate Conception
- Article by Rev Charles Dickson published in The Catholic Answer.
- http://mafg.home.isp-direct.com/mary03.htm

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.
- http://ewtn.com/library/ENCYC/P10IMCON.HTM

Memorandum on the Immaculate Conception
- By John Henry Cardinal Newman.
- http://www.cin.org/liter/memoimma.html

IQB: Aquinas and the Immaculate Conception
- James Akin's explanation of Thomas Aquinas' views on the issue of Mary's sinlessness.
- http://www.cin.org/users/james/questions/q052.htm

Ineffabilis Deus
- Defines the Immaculate Conception infallibly as dogma. Apostolic Constitution issued by Pope Pius IX on 8 December, 1854.
- http://www.catholic-forum.com/saints/bvm00013.htm

The Immaculate Conception - Satan's Mighty Foe
- Article by Father Paul A. Duffner, from the Rosary Center.
- http://www.rosary-center.org/ll50n6.htm

The Immaculate Virgin Conception of the Virgin Mary
- Ebooklet pertaining to the virgin conception and birth of Mary.
- http://www.catholicplanet.com/virgin/