Title: De Friese tak der Nassau's. [Catalogus Tentoonstelling. Leeuwarden, Fries museum 21 maart-30 april, 's Gravenhage, Oranje-Nassau museum 9 mei-15 juni.
Authors: Graswinckel, Dirk Petrus Marius, 1888-; Leeuwarden.; Hague (Netherlands).; House of Orange.