Croxton, F. E., & Cowden, D. J. (1934). Practical business statistics. Prentice-Hall.
Dyfyniad Arddull ChicagoCroxton, Frederick Emory, and Dudley Johnstone Cowden. Practical Business Statistics. New York: Prentice-Hall, 1934.
Dyfyniad MLACroxton, Frederick Emory, and Dudley Johnstone Cowden. Practical Business Statistics. Prentice-Hall, 1934.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.