TIFFIN, J. Industrial psychology#Joseph Tiffin. George Allen & Irwin.
Lua i Stíl Chicago (17ú heag.)TIFFIN, Joseph. Industrial Psychology#Joseph Tiffin. George Allen & Irwin.
Lua MLA (8ú heag.)TIFFIN, Joseph. Industrial Psychology#Joseph Tiffin. George Allen & Irwin.
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