- Author: Emanuela Di Gropello
- Language: English
- Year: 2010
- Author: Joost De Laat, Kara Hanson, Kara Hanson, Agnes Soucat
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- Year: 2010
- Author: Sivaguru Ganesan
- Language: English
- Year: 2000
- Author: Wolfgang Hoeschele, Ms Miriam Kennet
- Language: English
- Year: 2010
- Author: Charles T. Clotfelter, Ronald G. Ehrenberg, Malcolm Getz, John J. Siegfried
- Language: English
- Year: 1992