http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Wilbur B. England and Michiel R. Leenders.
The 1st and 2d edition by H. T. Lewis published under title: Procurement: principles and cases; 3d edition by H. T. Lewis and W. B. England; 4th edition by W. B. England; 5th edition published under title: Modern procurement management: principles and cases.