The Frysk Hânwurdboek is a monolingual dictionary of Frisian: words are explained in Frisian itself, with their meanings, usage and examples. It was compiled by Pieter Duijff, Frits van der Kuip, Rienk de Haan and Hindrik Sijens and published in 2008. It’s a reference for anyone who reads or writes Frisian, from learners and teachers to researchers.