[1]
Feenstra, H. 1999. Th.S.B. Johnston, Codex Hummercensis (Groningen, UB, PEIP 12). An old Frisian legal manuscript in Low Saxon guise. BMGN - Low Countries Historical Review. 114, 4 (Jan. 1999), 589–591. DOI:https://doi.org/10.18352/bmgn-lchr.5099.