Hirsch, C. R., Hayes, S., Mathews, A., Perman, G., & Borkovec, T. (2012). The Extent and Nature of Imagery During Worry and Positive Thinking in Generalized Anxiety Disorder. American Psychological Association.

Hirsch, Colette R., Sarra Hayes, Andrew Mathews, Gemma Perman, ja Tom Borkovec. The Extent and Nature of Imagery During Worry and Positive Thinking in Generalized Anxiety Disorder. American Psychological Association, 2012.

Hirsch, Colette R., et al. The Extent and Nature of Imagery During Worry and Positive Thinking in Generalized Anxiety Disorder. American Psychological Association, 2012.