Friedlander, L. (1982). Factory valleys: Ohio & Pennsylvania / Lee Friedlander. Callaway.
Cita Chicago (17th ed.)Friedlander, Lee. Factory Valleys: Ohio & Pennsylvania / Lee Friedlander. New York: Callaway, 1982.
Cita MLA (8th ed.)Friedlander, Lee. Factory Valleys: Ohio & Pennsylvania / Lee Friedlander. Callaway, 1982.
Atenció: Aquestes cites poden no estar 100% correctes.