Παραπομπή APA

Entelek incorporated Massachusetts. (1964). Sales forecasting. Entelek Inc, Newburyport.

Παραπομπή Chicago Style

Entelek incorporated Massachusetts. Sales Forecasting. Massachusetts: Entelek Inc, Newburyport, 1964.

Παραπομπή MLA

Entelek incorporated Massachusetts. Sales Forecasting. Entelek Inc, Newburyport, 1964.