http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Problems and questions on the Principles of economics
"Designed to accompany Principles of economics, revised edition, by Frederic B. Garver and Alvin H. Hansen."--Pref.
"Selected references for further reading" at end of each chapter.