Perkins, A., Kemp, S. E., & Corr, P. Fear and anxiety as separable emotions: An investigation of the revised reinforcement sensitivity theory of personality. Emotion, 7(2), pp. 252-261. doi:10.1037/1528-3542.7.2.252

Perkins, Adam, Samantha E. Kemp, and Philip Corr. "Fear and Anxiety As Separable Emotions: An Investigation of the Revised Reinforcement Sensitivity Theory of Personality." Emotion 7, no. 2 (): 252-261.

Perkins, Adam, Samantha E. Kemp, and Philip Corr. "Fear and Anxiety As Separable Emotions: An Investigation of the Revised Reinforcement Sensitivity Theory of Personality." Emotion 7.2 (): 252-261.