Spiegel, J. (1994). Manager's official guide to team working. Pfeiffer & Co.
Lua i Stíl Chicago (17ú heag.)Spiegel, Jerry. Manager's Official Guide to Team Working. Amsterdam: Pfeiffer & Co, 1994.
Lua MLA (9ú heag.)Spiegel, Jerry. Manager's Official Guide to Team Working. Pfeiffer & Co, 1994.
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