Veen, T. 1980. W.J. Buma, W. Ebel, M. Tragter-Schubert, Westerlauwerssches Recht, I, Jus Municipale Frisonum, I en II. BMGN - Low Countries Historical Review. 95, 2 (Jan. 1980), 396–399. DOI:https://doi.org/10.18352/bmgn-lchr.2165.