SOURCES
Baker, Gary E., Holly Hoover McCluskey, Jane Shaded Spillman, G. Eason Eige, James S. Measell, & Kenneth M. Wilson (1994), Wheeling Glass 1829-1939: Collection of the Oglebay Institute Glass Museum, Oglebay Institute: Wheeling, WV {ISBN 1-57080-002-2}.
Heacock, William, James Measell, & Berry Wiggins (1990), Harry Northwood: The Early Years 1881-1900, Antique Publications: Marietta, OH {ISBN 0-915410-39-7}.
Heacock, William, James Measell, & Berry Wiggins (1991), Harry Northwood: The Wheeling Years 1901-1925, Antique Publications: Marietta, OH {ISBN 0-915410-74-5}.
ONLINE SOURCES
https://www.carnivalglassworldwide.com/harry-northwood.html (Glen and Stephen Thistlewood)