1. ^{{Cite web|url=http://www.cs.ox.ac.uk/people/geraint.jones/ruby/|title=The Ruby relational design language|last=|first=|date=|website=Oxford University Computing Laboratory|publisher=University of Oxford|archive-url=|archive-date=|dead-url=|access-date=November 18, 2018}}
2. ^{{Cite journal|last=Chen|first=Gang|date=2012|title=A Short Historical Survey of Functional Hardware Languages|url=https://www.hindawi.com/journals/isrn/2012/271836/|journal=International Scholarly Research Notices|volume=2012|pages=|doi=10.5402/2012/271836|via=Hindawi}}
3. ^{{Cite book|url=https://books.google.com/books?id=GiLjBwAAQBAJ&pg=PA206&dq=Ruby+(hardware+description+language)&hl=en&sa=X&ved=0ahUKEwiN78DC197eAhXHT98KHbGiA6cQ6AEIMzAC#v=onepage&q=Ruby%20(hardware%20description%20language)&f=false|title=Functional Programming: Proceedings of the 1989 Glasgow Workshop 21–23 August 1989, Fraserburgh, Scotland|last=Davis|first=Kei|last2=Hughes|first2=John|publisher=Springer Science & Business Media|year=2012|isbn=9781447131663|location=|pages=206}}
4. ^{{Cite web|url=http://www.cs.ox.ac.uk/people/geraint.jones/publications/#ruby.papers|title=Geraint Jones - Publications|last=Jones|first=Geraint|date=|website=Department of Computer Science|publisher=University of Oxford|archive-url=|archive-date=|dead-url=|access-date=November 18, 2018}}
5. ^{{Cite web|url=https://github.com/philtomson/RHDL|title=philtomson / RHDL|last=Tomson|first=Phil|date=|website=GitHub|archive-url=|archive-date=|dead-url=|access-date=November 18, 2018}}
6. ^S. Guo and W. Luk, Compiling Ruby into FPGAs, in Field Programmable Logic and Applications, W. Moore and W. Luk (editors), LNCS 975, pp. 188-197, Springer, 1995.