Sommerfeld, R. M. (1974). Federal taxes and management decisions. Irwin.
Lua i Stíl Chicago (17ú heag.)Sommerfeld, Raynard M. Federal Taxes and Management Decisions. Homewood, Ill: Irwin, 1974.
Lua MLA (9ú heag.)Sommerfeld, Raynard M. Federal Taxes and Management Decisions. Irwin, 1974.
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