Freund, J. E., & Williams, F. J. (1982). Elementary business statistics: The modern approach (4th ed.). Prentice-Hall International.
Lua i Stíl Chicago (17ú heag.)Freund, John E., agus Frank Jefferson Williams. Elementary Business Statistics: The Modern Approach. 4th ed. London: Prentice-Hall International, 1982.
Lua MLA (9ú heag.)Freund, John E., agus Frank Jefferson Williams. Elementary Business Statistics: The Modern Approach. 4th ed. Prentice-Hall International, 1982.
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