W.J. Formsma, Historie van Groningen. Stad en land. BMGN-LCHR [Internet]. 1977 Jan. 1 [cited 2024 Sep. 30];92(2):308-10. Available from: https://ojstest.minions.amsterdam/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-102154