Cognitive approaches to obsessions and compulsions : theory, assessment, and treatment / edited by Randy O. Frost, Gail Steketee
New York : Pergamon, 2002 Edition

5th Floor Books RC533 .C625 2002

Obsessional-Beliefs Questionnaire (OBQ-87)
p. 477

Interpretation of Intrusions Inventory (III-31)
p. 489