Rishel, J. F. (1990). Founding families of Pittsburgh: The evolution of a regional elite, 1760-1910. University of Pittsburgh Press.
Lua i Stíl Chicago (17ú heag.)Rishel, Joseph Francis. Founding Families of Pittsburgh: The Evolution of a Regional Elite, 1760-1910. Pittsburgh: University of Pittsburgh Press, 1990.
Lua MLA (9ú heag.)Rishel, Joseph Francis. Founding Families of Pittsburgh: The Evolution of a Regional Elite, 1760-1910. University of Pittsburgh Press, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.