- Author: Barry T. Hirsch
- Language: English
- Year: 1991
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- Language: English
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- Language: English
- Year: 1993
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- Year: 1995
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- Year: 1999
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- Language: English
- Year: 1998
- Author: Annette N. Brown Western Michigan University. Dept. of Economics W.E. Upjohn Institute for Employment Research
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- Year: 1999
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- Language: English
- Year: 1999
- Author: Ethan B. Kapstein Branko Milanovic
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- Year: 2003
- Author: Julie L. Hotchkiss
- Language: English
- Year: 2002