"Heidi Guthmann Birck - Aage Birck, Skulptur - Unika", catalogue with preface by Lise Funder, director of udstillingsbygningen NIKOLAJ, Copenhagen and  Dr. Eckard Wagner, director of Emslandmuseum Schloss Clemenswerth, D-Sögel,

ISBN 87-98183-73 Multi Mud, 1988.