Columbia subject headings:
Art--Technique.
Theophilus, Presbyter, active 12th century. De diversis artibus.
Harvard subject headings:
Art, Medieval--Congresses
Art--Technique
Art--Technique--History--Congresses.
Color in art--History--Congresses.
Pigments--History--Congresses.
Theophilus, Presbyter, active 12th century. De diversis artibus--Congresses.
Theophilus, Presbyter, active 12th century. De diversis artibus.
Princeton subject headings:
Art--Technique.
Theophilus, Presbyter, active 12th century. De diversis artibus.