Sonderborg slot.

MLA

Clausens, M. Sonderborg Slot. Allerod: Gronlund's Forlag, n.d.

APA

Clausens, M. (n.d). Sonderborg slot. Allerod: Gronlund's Forlag.

Chicago

Clausens, M. Sonderborg Slot. Allerod: Gronlund's Forlag, n.d.