"Resumé 1966 - 1999", Heidi Guthmann Birck, Aage Birck - Skulptur Unika,

 by art critic and art historian Lisbeth Tolstrup. Preface by curator Birgit Jenvold,

Museet på Koldinghus, and director Peter-Winfried Bürkner, KERAMION,

Museum für zeitgenössische keramische Kunst, Frechen, Germany.

ISBN 87-21-01232-6, Borgens Forlag, Copenhagen, 1999.