APA (7th ed.) Citation

Chisholm, R. K., & Whitaker, G. R. (1971). Forecasting methods. Irwin.

Chicago Style (17th ed.) Citation

Chisholm, Roger K., and Gilbert R. Whitaker. Forecasting Methods. Homewood, Ill: Irwin, 1971.

MLA (9th ed.) Citation

Chisholm, Roger K., and Gilbert R. Whitaker. Forecasting Methods. Irwin, 1971.