One of a series of guides published by Bygningskultur Danmark for the main periods of Danish architecture. This is an excellent overview of Funkis or functional architecture with photographs of many of the important houses and apartment buildings that survive but also with contemporary drawings, plans and cartoons. 

Pages of photograph set out examples and information about appropriate and inappropriate attempts at conservation and the book has good examples of fittings from the period, such as door handles and radiators and so on that may have been replaced in the houses and apartments that survive.

Funkishuset en Bevaringsguide, Jeanne Brüel, Bygningskultur Danmark (2014) ISBN 978-87-90915-94-0

Bygningskultur Danmark