Olatunji, B. O., Woods, C., de Jong, P. J., Teachman, B., Sawchuk, C. N., & David, B. (2009). Development and initial validation of an abbreviated Spider Phobia Questionnaire using item response theory. Behavior Therapy, 40, 114-130.
Spider Phobia Questionnaire – 15
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EARL at Vanderbilt University 