Freed, E. J. (1991). Basic business statistics. Harcourt Brace Jovanovich.
Lua i Stíl Chicago (17ú heag.)Freed, E. J. Basic Business Statistics. San Diego: Harcourt Brace Jovanovich, 1991.
Lua MLA (9ú heag.)Freed, E. J. Basic Business Statistics. Harcourt Brace Jovanovich, 1991.
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