Landsburgh, R. H. (1926). Industrial safety. The American Avademy of Political and Social Science.
Lua i Stíl Chicago (17ú heag.)Landsburgh, Richard Hines. Industrial Safety. Philadelphia: The American Avademy of Political and Social Science, 1926.
Lua MLA (9ú heag.)Landsburgh, Richard Hines. Industrial Safety. The American Avademy of Political and Social Science, 1926.
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