MULDER-BAKKER, A.B. R.H. Bremmer jr., Hir is eskriven. Lezen en schrijven in de Friese landen rond 1300. BMGN - Low Countries Historical Review, [S. l.], v. 121, n. 1, p. 131–132, 2006. DOI: 10.18352/bmgn-lchr.6358. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-107297.. Acesso em: 17 aug. 2024.