APA (7th ed.) Citation

Reynolds, L. G., & Michas, N. A. (1971). Programmed learning aid for principles of economics: Macro. Learning System Co.

Chicago Style (17th ed.) Citation

Reynolds, Lloyd G., and Nicholas A. Michas. Programmed Learning Aid for Principles of Economics: Macro. Homewood, Ill: Learning System Co, 1971.

MLA (9th ed.) Citation

Reynolds, Lloyd G., and Nicholas A. Michas. Programmed Learning Aid for Principles of Economics: Macro. Learning System Co, 1971.