Williamson, G. K. (1998). Smart Guide to making wise investments. Cader Books : Wiley.
Lua i Stíl Chicago (17ú heag.)Williamson, Gordon K. Smart Guide to Making Wise Investments. New York: Cader Books : Wiley, 1998.
Lua MLA (8ú heag.)Williamson, Gordon K. Smart Guide to Making Wise Investments. Cader Books : Wiley, 1998.
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