Armstrong, James B.; Bradford, S. Sydney (February 24, 1975). "The Brooklyn Bridge"(PDF). National Register of Historic Places Inventory-Nomination. National Park Service. Archived from the original(PDF) on November 27, 2007.
Armstrong, James B.; Bradford, S. Sydney (February 24, 1975). "The Brooklyn Bridge"(PDF). National Register of Historic Places Inventory-Nomination. National Park Service. Archived from the original(PDF) on November 27, 2007.