APA

Bratt E. C., . (1958). Business forecasting. N.Y: McGraw Hill,l.

Chicago

Bratt Elmer Clark, . 1958. Business forecasting. N.Y: McGraw Hill,l.

Harvard

Bratt E. C., . (1958). Business forecasting. N.Y: McGraw Hill,l.

MLA

Bratt Elmer Clark, . Business forecasting. N.Y: McGraw Hill,l. 1958.