Spirituality and mysticism

• Bibliotheca Sanctorum, the complete collection in 12 vols. (https://archive.org/details/bibliotheca-sanctorum)

• Dictionnaire de spiritualité ascétique et mystique, complete in 16 t.

T. 1-5 https://archive.org/details/dictionnaire-de-spiritualite-tome-04.2-esp-ez

T. 6-10 https://archive.org/details/dictionnaire-de-spiritualite-tome-10-m 

T. 10-16 https://archive.org/details/dictionnaire-de-spiritualite-tome-10-m_202104

• The Society of the bollandists (Brussels) (https://bollandistes.org)

• The Hagiography Circle, the status of causes for beatification and canonisation (newsaints.faithweb.com)

• Ökumenisches Heiligenlexikon (www.heiligenlexikon.de)

• The Pilgrims guide: Pilgrimage routes in the Middle Ages (https://thepilgrimsguide.com)