"Moderne Keramik des 20. Jahrhunderts",- catalogue of the collection

 Hinder/Reimers des Landes Rheinland-Pfalz, by art historian

Dr. Ingrid Vetter. Works by Heidi Guthmann Birck from 1980 to 1985.

 ISBN 978-3-89790-275-6   Arnoldsche, Germany.