Thomas A. Cook 
Growing and Managing Foreign Purchasing [PDF ebook] 

This book compares the basic skillset of domestic purchasing to that of global purchasing. It provides a very detailed blueprint and best practices guide for avoiding costly mistakes and improving purchasing effectiveness. It also details supply chain globalization impacts on freight, logistics, customs issues, managing foreign suppliers, risk mitigation, and profit potential improvement. It differentiates itself from other books as being more comprehensive, detailed, and broad reaching into every aspect of purchasing on an international scale.