Ruby in a nutshell - a desktop quick reference. - Yukihiro Matsumoto 001 (O'Reilly, 2002)

The Ruby programming language - everything you need to know: covers Ruby 1.8 and 1.9. - David Flanagan; Yukihiro Matsumoto 001 (O'Reilly, 2008)

From Lisp to Ruby to Rubinius. - Yukihiro Matsumoto 001 (S3, 2010)

Embedded System Development by Lightweight Ruby. - Kazuaki Tanaka; Yukihiro Matsumoto 001; Hiroshi Arimori (ICCSA Workshops, 2011)

mruby - Rapid Software Development for Embedded Systems. - Kazuaki Tanaka; Avinash Dev Nagumanthri; Yukihiro Matsumoto 001 (ICCSA (Short Papers/poster papers/PhD student showcase works), 2015)