Cowden, D. (1963). Practical Problems in business statistics (2nd.). Prentia hall.
Citazione stile Chigago Style (17a edizione)Cowden, Dudley. Practical Problems in Business Statistics. 2nd. Glewood cliffs: Prentia hall, 1963.
Citatione MLA (9a ed.)Cowden, Dudley. Practical Problems in Business Statistics. 2nd. Prentia hall, 1963.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.