found: Wagner, E. M. Economy of old and Ambridge ... 1924.
found: NUCMC data from Pa. Hist. and Museum Comm. for Duss, J. S. Papers, 1882-1951(Ambridge, Pa.; communal settlement called Economy, in Beaver Co., Pa., settled by Harmony Society, 1825-1905; land sold to Ambridge, Pa.)
found: Hottenstein, J. Incorp. dates for Pa. municipalities, c1965(Ambridge; borough, Beaver Co., inc. 1905; laid out or settled, 1903; inc. from Harmony Township which was inc. 1854 from Economy Township)
found: Rand McNally commer. atl., c1984(Ambridge, Pa.; Beaver [County])
found: Guide to Pa. towns, c1982(Ambridge; named for American Bridge Company)
found: GeoNames, algorithmically matched, 2009(ppl; 40°35ʹ21ʺN 080°13ʹ30ʺW)