| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Silver Shades of Grey: Memos for Active Ageing in the 21st Century | 978-981-323-133-7 (981-323-133-5) | 2018 |
| Silver Shades Of Grey: Memos For Successful Ageing In The 21St Century | 978-981-323-373-7 (981-323-373-7) | 2018 |