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Steyn F. C. Three unknown Carthusian Manuscripts with Music of the 14th to the 16th Centuries in the Grey Collection, South African Library, Cape Town, 2 vol. Salzburg : Universität Salzburg, Institut für Anglistik und Amerikanistik, 2000.

Steyn F. C. The Medieval and Renaissance Manuscripts in the Grey collection of the National Library of South Africa, Cape Town, 2 vol. Salzburg : Universität Salzburg, Institut für Anglistik und Amerikanistik, 2002.

Hodgson P. . The «Cloud of unknowing» and Related Treatises on Contemplative Prayer. The «Book of Privy Counselling», The «Epistle of Prayer», The «Epistle of Discretion», «Hid Divinity», «Benjamin Minor», The «Study of Wisdom», «Of Discerning of Spirits». Salzburg : Universität Salzburg, Institut für Anglistik und Amerikanistik, 1982.