1.) 10 Days to a More Powerful Vocabulary
The Princeton Language Institute, Ph.D. Tom Nash
Grand Central Publishing; 2001
Paperback

2.) 10 Days to a Sharper Memory
The Princeton Language Institute, Russell Roberts, Paul Kirby (reader)
Hachette Audio; 2002
Audio Cassette

3.) 10 Days to Faster Reading
The Princeton Language Institute, Abby Marks-Beale
Grand Central Publishing; 2001
Paperback

4.) 10 Days to More Confident Public Speaking
The Princeton Language Institute, Lenny Laskowski
Grand Central Publishing; 2001
Paperback

5.) 10 Days to More Confident Public Speaking
The Princeton Language Institute, Lenny Laskowski, Peter McHugh (reader)
Hachette Audio; 2002
Audio Cassette

6.) Roget's 21st Century Thesaurus in Dictionary Form
The Princeton Language Institute
Barnes & Noble; 1999
Hardcover