Borger, G.J. 1997. “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 (2): 248-50. https://doi.org/10.18352/bmgn-lchr.4460.