Siegel, D. R., & Siegel, D. F. (1990). Futures markets. The Dryden Press.
Lua i Stíl Chicago (17ú heag.)Siegel, Daniel Richard, agus Diane F. Siegel. Futures Markets. Chicago: The Dryden Press, 1990.
Lua MLA (9ú heag.)Siegel, Daniel Richard, agus Diane F. Siegel. Futures Markets. The Dryden Press, 1990.
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