Barth, P. S. 1. (1987). The tragedy of black lung: Federal compensation for occupational disease. W.E. Upjohn Institute for Employment Research.
Lua i Stíl Chicago (17ú heag.)Barth, Peter S. 1937. The Tragedy of Black Lung: Federal Compensation for Occupational Disease. Kalamazoo, MI: W.E. Upjohn Institute for Employment Research, 1987.
Lua MLA (9ú heag.)Barth, Peter S. 1937. The Tragedy of Black Lung: Federal Compensation for Occupational Disease. W.E. Upjohn Institute for Employment Research, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.