O's ยท O. Sergeeva
| title | ISBN-13 | year of publication |
|---|---|---|
| Kak legko obshchatsia s raznymi liudmi | 978-5-699-78719-7 | 2015 |
| Kak nauchitsya razbiratsya v lyudyah | 978-5-699-55709-7 | 2012 |
| Kak probudit uverennost v sebe. 50 prostyh pravil | 978-5-699-54397-7 | 2019 |
| Kak stat svoim na novoy rabote. 50 prostyh pravil | 978-5-699-82660-5 | 2015 |