Jelaskan Catatan dari Salib Lothair

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Legner, Anton (ed). Ornamenta Ecclesiae, Kunst und Künstler der Romanik. Catalogue of an exhibition in the Schnütgen Museum, Köln, 1985. 3 vols.

Schiller, Gertrud, Iconography of Christian Art, Vol. II, 1972 (English trans from German), Lund Humphries, London,

Swarzenski, Hanns. Monuments of Romanesque Art; The Art of Church Treasures in North-Western Europe, Faber and Faber, 1974,