Drever, J. (1921). The psychology of industry. Methuen & co., ltd.
Lua i Stíl Chicago (17ú heag.)Drever, James. The Psychology of Industry. London: Methuen & co., ltd, 1921.
Lua MLA (8ú heag.)Drever, James. The Psychology of Industry. Methuen & co., ltd, 1921.
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