Dyfyniad APA

Barth, P. S. 1. (1987). The tragedy of black lung: Federal compensation for occupational disease. W.E. Upjohn Institute for Employment Research.

Dyfyniad Arddull Chicago

Barth, Peter S. 1937. The Tragedy of Black Lung: Federal Compensation for Occupational Disease. Kalamazoo, MI: W.E. Upjohn Institute for Employment Research, 1987.

Dyfyniad MLA

Barth, Peter S. 1937. The Tragedy of Black Lung: Federal Compensation for Occupational Disease. W.E. Upjohn Institute for Employment Research, 1987.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.