Rhys ap Morgan's Disappearance (sources)
- Fairy Legends of the South of Ireland, Vol. III, by Thomas Crofton Croker, 1828 London, England. Pgs. 215-220. Online at: http://books.google.com/books?id=Ol1aQ_Gq4tQC&pg=PA218&dq=crofton+croker+fairy+legends+%22rhys+ap+morgan%22&hl=en&sa=X&ei=Fhl1U5maJMf3oASlmIGwAg&ved=0CC0Q6AEwAA#v=onepage&q=crofton%20croker%20fairy%20legends%20%22rhys%20ap%20morgan%22&f=false
Mentions & Repeaters
- The Hand-Book of the Vale of Neath, 1852 Neath, Wales. NOTE: This is essentially a travel guide to the Vale of Neath, with no stative author, and simply reprints Croker's book verbatim. Pgs. 72-76. Online at:http://books.google.com/books?id=ZbgHAAAAQAAJ&pg=PA72&dq=rhys+ap+morgan+%22vale+of+neath%22&hl=en&sa=X&ei=euNzU6v6IIK_oQTd4oHwBQ&ved=0CCsQ6AEwAA#v=onepage&q=rhys%20ap%20morgan%20%22vale%20of%20neath%22&f=false
- Unexplained Phenomena: A Rough Guide Special (1st edition), by Bob Rickard and John Michell, 2000 Rough Guides, Ltd., 62-70 Shorts Gardens, London, England. ISBN: 1-85828-589-5. pg. 131,133