Newbold, P. (1995). Statistics for business & economics (4th ed.). Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Newbold, Paul. Statistics for Business & Economics. 4th ed. Englewood Cliffs, N.J: Prentice-Hall, 1995.
Lua MLA (9ú heag.)Newbold, Paul. Statistics for Business & Economics. 4th ed. Prentice-Hall, 1995.
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