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"Is Purgatory in the Bible?". A Catholic answer.  Is Purgatory in the Bible? on Internet Archive

Purgatory. Encyclopædia Britannica Online. 2009.

English c. 1200 wall painting with an image of a ladder, reminiscent of icons such as the Ladder of Divine Ascent, which has been interpreted as a "purgatorial ladder"

Quran Inspector: Chapter 7: "The Purgatory (Al-A'araf)" ( سورة الأعراف ) at submission.org