References:
Omni Shoreham Hotel, Washington D.C. | Haunted Rooms America
The Hay-Adams Hotel | Haunted Washington (ghostcitytours.com)
Woodrow Wilson House | Haunted Places | Washington, DC 20008
Washington DC History & Stories of Old DC - Ghosts of DC
Old Stone House - Washington, DC - Ghosts and Hauntings on Waymarking.com
Georgetown's Haunted Halcyon House – Washington, D.C. - Atlas Obscura
Haunted Lafayette Square Park | The Ghosts of Lafayette Square (ghostcitytours.com)
White House Ghost Stories - White House Historical Association (whitehousehistory.org)
The Octagon House – Haunted Houses