Nielsen, Kay.

• Danmarks konger og dronninger
• Antikvitetsleksikon
• Boernenes soeroeverhistorier
• Danske ordsprog
• Denmark as seen from above = Da nemark aus der vogelschau = le Danemark vu de l'air = Dinamarca a vista de pajaro
• Kay Nielsen
• Statens Vejlaboratorium 1928-1978
• The Bookman portfolio containing plates in colour by Kay Nielsen illustrating Hansel and Gretel and other stories by the brothers Grimm
• The unknown paintings of Kay Nielsen