Mood, A. M., & Graybill, F. A. D. C. B. (1974). Introduction to the theory of statistics (Third edition.). McGraw-Hill Book Company.

Mood, Alexander M., and Franklin A.; Duane C. Boes Graybill. Introduction to the Theory of Statistics. Third edition. Auckland: McGraw-Hill Book Company, 1974.

Mood, Alexander M., and Franklin A.; Duane C. Boes Graybill. Introduction to the Theory of Statistics. Third edition. McGraw-Hill Book Company, 1974.