Rosenthal, Earl, The Invention of the Columnar Device of Emperor Charles V at the Court of Burgundy in Flanders in 1516, in: Journal of the Warburg and Courtauld Institutes 36 (1973), S. 198-230.

Rosenthal, Earl, Plus ultra, non plus ultra, and the Columnar Device of Emperor Charles V, in: Journal of the Warburg and Courtauld Institutes 34 (1971), S. 204-228.