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Ellis R. . Viderunt eam Filie Syon: The Spirituality of the English House of a Medieval Contemplative Order from its Beginnings to the Present Day. Salzburg : Universität Salzburg, Institut für Anglistik und Amerikanistik, 1984.

Marks R. B. . The Medieval Manuscript Library of the Charterhouse of St Barbara in Cologne, vol. 1,. New York : Mellen Press, 1974.

Marks R. B. . The Medieval Manuscript Library of the Charterhouse of St Barbara in Cologne, vol. 2. New York : Mellen Press, 1974.