APA aipamena

Keay, F. (1971). Marketing and sales forecasting. Pergamon Press.

Chicago Style aipamena

Keay, Frederick. Marketing and Sales Forecasting. Oxford: Pergamon Press, 1971.

MLA aipamena

Keay, Frederick. Marketing and Sales Forecasting. Pergamon Press, 1971.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.