“Cawood Castle.” Mysterious Britain and Ireland. January 5, 2012. https://www.mysteriousbritain.co.uk/hauntings/cawood-castle/
“Cawood Castle.” The Landmark Trust. Date Unknown. https://www.landmarktrust.org.uk/search-and-book/properties/cawood-castle-6033/#Overview
“Cawood Castle.” Wikipedia. Date Unknown. https://en.wikipedia.org/wiki/Cawood_Castle
“Cawood: A Cardinal’s Lamentable Treason.” The Tudor Travel Guild. Date Unknown. https://thetudortravelguide.com/2019/11/09/cawood/
“History of the Castle.” Cawood Heritage. Date Unknown. http://www.cawoodheritage.org.uk/wordpress/?page_id=41
Tom Ogden. Haunted Hotels. Guilford: Globe Pequot Press, 2010. https://www.google.com/books/edition/Haunted_Hotels/8FsC7YPJGOUC?hl=en&gbpv=1&dq=castle+leslie+haunted&pg=PA199&printsec=frontcover
Paul Fennel, Haunted. Dublin: Poolberg Press Ltd., 2006. https://www.google.com/books/edition/Haunted/cgojDAAAQBAJ?hl=en&gbpv=1&dq=castle+leslie+haunted&pg=PT222&printsec=frontcover
“Castle Leslie Estate.” Spirited Isle. Date unknown. https://spiritedisle.ie/explore-listing/castle-leslie-estate/
“Castle Leslie - Ghost Story.” Celtic Castles. Date unknown. https://www.celticcastles.com/articles/castle-leslie-ghost-story/
"The Haunted Castle Leslie, Co. Monaghan, Ireland.” Haunted Rooms. Date unknown. https://www.hauntedrooms.co.uk/product/castle-leslie
“The Red Master Room.” Castle Leslie Estate. Date unknown. https://www.castleleslie.com/room/the-red-room/
Lady Leonora Tankerville. “The Ghosts of Chillingham Castle.” 1925. https://images.visitnorthumberland.com/Chillingham-Castle-Chillingham/chillingham-ghost-booklet.pdf
Letter to Lady Tankerville. September 24, 1925. The Arthur Conan Doyle Encyclopedia. https://www.arthur-conan-doyle.com/index.php/Letter_to_Lady_Tankerville_(24_september_1925)
“History of the Castle.” Chillingham Castle. https://chillingham-castle.com/history-of-the-castle/
“Chillingham Castle.” Wikipedia. Last updated December 12, 2024. https://en.wikipedia.org/wiki/Chillingham_Castle
“Chillingham Castle.” Little House of Horrors. https://thelittlehouseofhorrors.com/chillingham-castle/
“Ghosts of Chillingham Castle.” Great Castles. https://great-castles.com/chillinghamghost.html
“The Greys and the Bennets.” Chillingham Wild Cattle Association. https://chillinghamwildcattle.com/history/greys/
Richard Jones. Haunted Castles of Britain and Ireland. Barnes and Noble, 2003. https://archive.org/details/hauntedcastlesof0000rich/page/136/mode/2up?q=“chillingham+Castle”+
“Medici princess freed from bad Victorian Photoshop,” The History Blog, June 30, 2014, http://www.thehistoryblog.com/archives/31197
“A Determined Art Conservator Restores a Painting of the Doomed Party Girl Isabella de’ Medici: See the Before and After,” Open Culture, September 28, 2023, https://www.openculture.com/2023/09/art-conservator-restores-a-painting-of-the-doomed-party-girl-isabella-de-medici.html
“THE FASCINATING FIGURE OF ISABELLA DE' MEDICI,” ItsTuscany Magazine, November 23, 2018, https://www.itstuscany.com/en/the-fascinating-figure-of-isabella-de-medici/
“Isabella & Other Ghosts of the Past in Cerreto Guidi,” Tuscan Trends, July 4, 2019, http://www.tuscantrends.com/isabella-other-ghosts-of-the-past-in-cerreto-guidi/
“Isabella de' Medici Orsini,” A Modern Reveal, https://www.amodernreveal.com/isabella-de-medici-orsini
“Being a woman in Italy... in the Renaissance,” ArtTrav, May 8, 2013, https://www.arttrav.com/it/being-a-renaissance-woman/
“Isabella de’ Medici 1542-1576,” Madame Guillotine, October 24, 2011, https://madameguillotine.co.uk/2011/10/24/9436/
“The ghost of Isabella de Medici,” Emadion, April 20, 2017, https://emadion.it/en/paranormal/ghosts/ghost-isabella-de-medici/