Croxton, F. E., & Cowden, D. J. (1934). Practical business statistics. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Croxton, Frederick Emory, agus Dudley Johnstone Cowden. Practical Business Statistics. New York: Prentice-Hall, 1934.
Lua MLA (8ú heag.)Croxton, Frederick Emory, agus Dudley Johnstone Cowden. Practical Business Statistics. Prentice-Hall, 1934.
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