van Ruyven-Zeman, Zsuzsanna. “The Road to the Salvation of Mankind: Additions to the Series of Glass Designs by the Crabeth Brothers”. The Rijksmuseum Bulletin 69, no. 2 (June 15, 2021): 101–121. Accessed October 16, 2021. https://bulletin.rijksmuseum.nl/article/view/10073.