Shaffer, K. R. (1971). Decision making. Clive Bingley.
Lua i Stíl Chicago (17ú heag.)Shaffer, Kenneth R. Decision Making. London: Clive Bingley, 1971.
Lua MLA (9ú heag.)Shaffer, Kenneth R. Decision Making. Clive Bingley, 1971.
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