Croxton, F. E., Bolch, B. W., & Cowden, D. J. (1974). Practical business statistics (4th.ed.). Prentice-Hall.
Cita Chicago (17th ed.)Croxton, Frederick E., Ben W. Bolch, i Dudley J. Cowden. Practical Business Statistics. 4th.ed. New Delhi: Prentice-Hall, 1974.
Cita MLA (9th ed.)Croxton, Frederick E., et al. Practical Business Statistics. 4th.ed. Prentice-Hall, 1974.
Atenció: Aquestes cites poden no estar 100% correctes.