His Urban planning and civic order in Germany, 1860-1914, 1990: CIP t.p. (Brian Ladd) data sheet (b. 1957)

University of Chicago Press website, December 22, 2020: (Brian Ladd is an independent historian who received his Ph.D. from Yale University. He has taught history at the Rensselaer Polytechnic Institute and is a research associate in the history department at the University of Albany, State University of New York) https://press.uchicago.edu/ucp/books/author/L/B/au5471815.html