Isaiah William Penn Lewis
Origem: Wikipédia, a enciclopédia livre.
- Dolphin, Debbie; Jay Riedl (12 Mar 2007). "New England Lighthouse Wallpaper Guide to Lewis Patent Lamps and Spherical Reflectors". New England Lighthouse Wallpapers. Debbie Dolphin. Consult. 9 de março de 2014.
- D'Entremont, Jeremy (7 February 2007). "Thacher Island Twin Lights History". New England Lighthouses - A Virtual Guide. Consult. 9 de março de 2014.
- A Review of the Report of I.W.P. Lewis on the State of the Light Houses on the Coasts of Maine and Massachusetts, Sent to the House of Representatives by the Hon. Walter Forward, Secretary of the Treasury, February 24, 1843