"Tradition & Fornyelse - Unika & Skulptur, Aage Birck & Heidi Guthmann Birck",

 catalogue with preface by H.O.Boysen, chairman of Haderslev Kunstforening

and Sven Jørn Andersen, director of Kunstmuseet Trapholt, Kolding.

ISBN 87-98 18 32-22, Multi Mud -1992.