“Tweemaal Friesland Tijdens De Agrarische Depressie”. BMGN - Low Countries Historical Review 89, no. 1 (January 1, 1974): 113–121. Accessed November 22, 2024. https://ojstest.minions.amsterdam/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-101959.