Hagelin, O. (1987). The art of writing and drawing: A selection of 100 books from the Ekström Collection in the National Library for Psychology and Education, Stockholm; a descriptive and annotated catalogue of 16th through 18th century rare and important books on calligraphy, perspective, architecture, drawing, anatomy, colours, and related arts. Stockholm: Statens Psykologisk-Pedagogiska Bibliotek (SPPB).

Hagelin, Ove. The Art of Writing and Drawing: A Selection of 100 Books From the Ekström Collection in the National Library for Psychology and Education, Stockholm; a Descriptive and Annotated Catalogue of 16th Through 18th Century Rare and Important Books On Calligraphy, Perspective, Architecture, Drawing, Anatomy, Colours, and Related Arts. Stockholm: Statens Psykologisk-Pedagogiska Bibliotek (SPPB), 1987.

Hagelin, Ove. The Art of Writing and Drawing: A Selection of 100 Books From the Ekström Collection in the National Library for Psychology and Education, Stockholm; a Descriptive and Annotated Catalogue of 16th Through 18th Century Rare and Important Books On Calligraphy, Perspective, Architecture, Drawing, Anatomy, Colours, and Related Arts. Stockholm: Statens Psykologisk-Pedagogiska Bibliotek (SPPB), 1987.