Feenstra H. Th.S.B. Johnston, Codex Hummercensis (Groningen, UB, PEIP 12). An old Frisian legal manuscript in Low Saxon guise. BMGN-LCHR [Internet]. 1999 Jan. 1 [cited 2024 Apr. 18];114(4):589-91. Available from: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-105846