Roelofs, Pieter. “Gold for Houkje Gerrits Bouma: The Women’s Skating Competition on the Stadsgracht in Leeuwarden on 21 January 1809, Painted by Nicolaas Baur”. The Rijksmuseum Bulletin 62, no. 2 (June 15, 2014): 152–187. Accessed November 23, 2024. https://bulletin.rijksmuseum.nl/article/view/9845.