The River Never Looks Back: Historical and Practical Foundations of Bert Hellinger's Family Constellations. Paperback – January 1, 2003

good overview and history of how the principles for Constellation work developed through the predecessorrs of Bert Hellinger to today

The work by Ursula Franke is one of the best I have read on family constellations. It is original, it has depth, it is well founded, it has new ideas and does not limit her work to the dynamics of the constellation. I highly recommend her work.