Borger, G.J. “M.A.W. Gerding, Vier Eeuwen Turfwinning. De Verveningen in Groningen, Friesland, Drenthe En Overijssel Tussen 1550 En 1950”. BMGN - Low Countries Historical Review 112, no. 2 (January 1, 1997): 248–250. Accessed May 5, 2024. https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-105144.