List of essential books for purchasing/ strategic sourcing/ procurement

I have prepared a list of essential books to read/ refer in the field of purchasing/ strategic sourcing/ procurement consulting (PRTM/ S& etc). This list is by no standards complete and is a work in progress. It would be so great if members of this forum could kindly go through the list and offer their valuable suggestions. The list is in google drive folder and anyone with the link below can edit and add/ remove books. Link: https://drive.google.com/file/d/0B0l6vEN2PqQAVjVK…

Thanks.