(1966). Anton Heyboer: Etsen - Collages ; 1 April - 30 April 1966.
Cita Chicago (17th ed.)Anton Heyboer: Etsen - Collages ; 1 April - 30 April 1966. Amsterdam, 1966.
Cita MLA (8th ed.)Anton Heyboer: Etsen - Collages ; 1 April - 30 April 1966. 1966.
Atenció: Aquestes cites poden no estar 100% correctes.