Ryan, B. F., Joiner, B. L., & Ryan, T. A. (1985). Minitab handbook (Second edition.). Duxbury Press.
Cita Chicago (17th ed.)Ryan, Barbara F., Brian L. Joiner, i Thomas A. Ryan. Minitab Handbook. Second edition. Boston: Duxbury Press, 1985.
Cita MLA (8th ed.)Ryan, Barbara F., et al. Minitab Handbook. Second edition. Duxbury Press, 1985.
Atenció: Aquestes cites poden no estar 100% correctes.