Hanke, J. E. W. (2013). Business forecasting (8th ed.). Cengage Learning.
Lua i Stíl Chicago (17ú heag.)Hanke, John E; Wichern. Business Forecasting. 8th ed. New Delhi: Cengage Learning, 2013.
Lua MLA (9ú heag.)Hanke, John E; Wichern. Business Forecasting. 8th ed. Cengage Learning, 2013.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.