Books all sourcing and procurement people should be reading right now.....??

Here are two i've read and would highly recommend. Trade wars, pandemics, and chaos: How digital procurement enables business success in a disordered world: Epstein, Dr. Elouise, DeCandia, Len. Profit from the Source: Transforming Your Business by Putting Suppliers at the Core: Schuh, Christian, Schnellbacher, Wolfgang, Triplat, Alenka, Weise, Daniel.