There is a new book available Hellmut Wollmann titled "Local Government and Governance in Germany Challenges, Responses and Perspectives". More information of the book here: https://www.google.es/books/edition/Local_Government_and_Governance_in_Germa/j3olEQAAQBAJ?hl=en&gbpv=0

http://rc05.ipsa.org/public/Sin_titulo.png

Also, there is a new edition of the classic book of our colleague "Introduction to Comparative Public Administration"  coauthored by Sabine Kuhlmann, Hellmut Wollmann and Renate Reiter