Croxton, F. E., Bolch, B. W., & Cowden, D. J. (1974). Practical business statistics (4th.ed.). Prentice-Hall.
Chicago-viite (17. p.)Croxton, Frederick E., Ben W. Bolch, ja Dudley J. Cowden. Practical Business Statistics. 4th.ed. New Delhi: Prentice-Hall, 1974.
MLA-viite (9. p.)Croxton, Frederick E., et al. Practical Business Statistics. 4th.ed. Prentice-Hall, 1974.
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