| 2006 |
Masayoshi Takahashi |
Ruby の歴史 |
| 2009 |
Masayoshi Takahashi |
Keynote Address: Ruby, Nihon Ruby-no-Kai and me |
| 2011 |
Masayoshi Takahashi |
Ruby-no-kai Itself and Some Related Projects. |
| 2013 |
Masayoshi Takahashi |
The History of Ruby;20th Anniversary Ed. |
| 2019 |
Masayoshi Takahashi |
(partially) Non-volatile mruby |