MOTTEL, W. J. (1995). Industrial Safety Is Good Business The Du Pont Story William J. Mottel, Joseph F.long, David E. Morrison. Van Nostrand.
Lua i Stíl Chicago (17ú heag.)MOTTEL, William J. Industrial Safety Is Good Business The Du Pont Story William J. Mottel, Joseph F.long, David E. Morrison. Van Nostrand, 1995.
Lua MLA (8ú heag.)MOTTEL, William J. Industrial Safety Is Good Business The Du Pont Story William J. Mottel, Joseph F.long, David E. Morrison. Van Nostrand, 1995.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.