Handbook of Frisian Studies = Handbuch des Friesischen
ed. Horst Haider Munske. Tübingen: Max Niemeyer Verlag, 2001. Gives a comprehensive survey of contemporary Frisian language and dialects, their history and literatures, and research trends in Frisian studies. Essays are evenly divided between English- and German-language contributions, each with a bibliography.
Available in print: PF1413 .H36 2001