Elwyn Edwards

• The Human operator in process control
• Enciclopedia del Caballo
• Cynefin
• Englynion Barddas
• Information transmission
• Smithsonian Handbooks
• The Human Operator in Process Control
• Angel a Thinsel
• Angel a thinsel
• Awen Lawen, Yr - Blodeugerdd Barddas o Gerddi Ysgafn a Doniol
• Bardd a Gollwyd, Y - Cofiant David Ellis
• Blodeugerdd Penllyn