Historic American Buildings Survey/Historic American Engineering Record, America's Industrial Heritage Project, Wallace, K. E., & Gillespie, N. (1989). The Character of a steel mill city: Four historic neighborhoods of Johnstown, Pennsylvania. Historic American Buildings Survey/Historic American Engineering Record, National Park Service.
Citace podle Chicago (17th ed.)Historic American Buildings Survey/Historic American Engineering Record, America's Industrial Heritage Project, Kim E. Wallace, a Natalie Gillespie. The Character of a Steel Mill City: Four Historic Neighborhoods of Johnstown, Pennsylvania. Washington, D.C.: Historic American Buildings Survey/Historic American Engineering Record, National Park Service, 1989.
Citace podle MLA (8th ed.)Historic American Buildings Survey/Historic American Engineering Record, et al. The Character of a Steel Mill City: Four Historic Neighborhoods of Johnstown, Pennsylvania. Historic American Buildings Survey/Historic American Engineering Record, National Park Service, 1989.