- Author: Linda Rener
- Language: English
- Year: 2001
- Author: Robert L. Longyear III
- Language: English
- Year: 2020
- Author: Hedman Glenn E
- Language: English
- Year: 2020
- Author: Wilkinson Richard G
- Language: English
- Year: 2006
- Author: Offit Paul A
- Language: English
- Year: 2010
- Author: Magee Mike
- Language: English
- Year: 2019
- Author: Brookings Institution., Haseltine William A
- Language: English
- Year: 2013
- Author: American Association of Retired Persons., Lynch Frederick R
- Language: English
- Year: 2011
- Author: Ries Hans Peter
- Language: German
- Year: 2008