Freund, J. E. (1967). Modern elementary statistics (3d ed.). Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Freund, John E. Modern Elementary Statistics. 3d ed. Englewood Cliffs, N.J.: Prentice-Hall, 1967.
Lua MLA (8ú heag.)Freund, John E. Modern Elementary Statistics. 3d ed. Prentice-Hall, 1967.
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