J. Hettinger

The Problem of Business Forecasting.

W. M. Persons, W. Thorp, W. Foster, 1925 .

The problem of business forecasting : papers presented at the eighty-fifth annual meeting of the American Statistical Association, Washington, D.C., Dec. 27-29, 1923

W. M. Persons, J. Hettinger, W. Forster, 1924 .