Παραπομπή APA

Mason, R. D., & Hermanson, R. H. (1970). Programmed Learning Aid For Business and Economic Statistics. Learning Systems.

Παραπομπή Chicago Style

Mason, Robert D., και Roger H. Hermanson. Programmed Learning Aid For Business and Economic Statistics. Homewood: Learning Systems, 1970.

Παραπομπή MLA

Mason, Robert D., και Roger H. Hermanson. Programmed Learning Aid For Business and Economic Statistics. Learning Systems, 1970.