Cardinal, R. The avant-garde in early twentieth-century Europe: Roger Cardinal. The nineteenth century, c. 1830 - 1914.(2013).

Cardinal, Roger. "The Avant-garde in Early Twentieth-century Europe: Roger Cardinal." The Nineteenth Century, C. 1830 - 1914.(2013) .

Cardinal, Roger. "The Avant-garde in Early Twentieth-century Europe: Roger Cardinal." The Nineteenth Century, C. 1830 - 1914.(2013), .