| title | ISBN-13 | year of publication |
|---|---|---|
| How to Retire Happy: Everything You Need to Know About the 12 Most Important Decisions You Must Make Before You Retire | 978-0-07-137993-9 | 2001 |
| How To Retire Happy: Everything You Need to Know about the 12 Most Important Decisions You Must Make before You Retire | 978-0-07-136034-0 | 2000 |
| How to Retire Happy, Fourth Edition: The 12 Most Important Decisions You Must Make Before You Retire | 978-0-07-180069-3 | 2013 |
| How to Retire Happy: The 12 Most Important Decisions You Must Make Before You Retire | 978-0-07-170247-8 | 2009 |
| How to Retire Happy: The 12 Most Important Decisions You Must Make Before You Retire | 978-0-07-146466-6 | 2005 |