Crosby, J. V. (2000). Cycles, trends and turning points: Practical marketing and sales forecasting techniques. Lincolnwood (Chicago), IL.: NTC Business Book.
Παραπομπή Chicago StyleCrosby, John V. Cycles, Trends and Turning Points: Practical Marketing and Sales Forecasting Techniques. Lincolnwood (Chicago), IL.: NTC Business Book, 2000.
Παραπομπή MLACrosby, John V. Cycles, Trends and Turning Points: Practical Marketing and Sales Forecasting Techniques. Lincolnwood (Chicago), IL.: NTC Business Book, 2000.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.