Resumé 1966-1999 : Heidi Guthmann Birck , Aage Birck ; Skulptur Unika.

MLA

Tolstrup, Lisbeth. Resumé 1966-1999 : Heidi Guthmann Birck , Aage Birck ; Skulptur Unika. Copenhagen Valby: Borgen, 1999.

APA

Tolstrup, L. (1999). Resumé 1966-1999 : Heidi Guthmann Birck , Aage Birck ; Skulptur Unika. Copenhagen Valby: Borgen.

Chicago

Tolstrup, Lisbeth Resumé 1966-1999: Heidi Guthmann Birck , Aage Birck ; Skulptur Unika. Copenhagen Valby: Borgen, 1999.