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, vol. 62, no. 2, June 2014, pp. 152-87, https://doi.org/10.52476/trb.9845.