APA (7th ed.) Citation

Plutchik, R. (1975). Programmed learning aid for emotion. Learning Systems.

Chicago Style (17th ed.) Citation

Plutchik, Robert. Programmed Learning Aid for Emotion. Homewood, Ill: Learning Systems, 1975.

MLA (9th ed.) Citation

Plutchik, Robert. Programmed Learning Aid for Emotion. Learning Systems, 1975.