GELLHORN, E. (1987). Regulated Industries Ernest Gellhorn, Richard J. Pierce. West Publishing Compan.
Lua i Stíl Chicago (17ú heag.)GELLHORN, Ernest. Regulated Industries Ernest Gellhorn, Richard J. Pierce. West Publishing Compan, 1987.
Lua MLA (8ú heag.)GELLHORN, Ernest. Regulated Industries Ernest Gellhorn, Richard J. Pierce. West Publishing Compan, 1987.
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