Posner, M. (1999). Successful credit control. J. Wiley.
Lua i Stíl Chicago (17ú heag.)Posner, Martin. Successful Credit Control. Chichester ; Hodder & Stoughton ; New York : London: J. Wiley, 1999.
Lua MLA (8ú heag.)Posner, Martin. Successful Credit Control. J. Wiley, 1999.
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