Watts, F. (1921). An introduction to the psychological problems of industry. Allen & Unwin.
Lua i Stíl Chicago (17ú heag.)Watts, Frank. An Introduction to the Psychological Problems of Industry. London: Allen & Unwin, 1921.
Lua MLA (8ú heag.)Watts, Frank. An Introduction to the Psychological Problems of Industry. Allen & Unwin, 1921.
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