1. Gould GM, Pyle WL. Anomalies and Curiosities of Medicine: Being an Encyclopedic Collection of Rare and Extraordinary Cases, and of the Most Striking Instances of Abnormality in All Branches of Medicine and Surgery, Derived From an Exhaustive Research of Medical Literature From Its Origin to the Present Day: Abstracted, Classified, Annotated, and Indexed. W.B. Saunders, Philadelphia, PA; 1897. http://resource.nlm.nih.gov/57221200R.
2. Self-insertion of a screwdriver into the rectum for sexual pleasure: a case report;Sharif M;Australas J Paramedicine,2013
3. Perforation of the urinary bladder caused by transurethral insertion of a pencil for the purpose of masturbation in a 29-year-old female;Bantis A;Case Rep Med,2010
4. 'Putting lead in your pencil': self-insertion of an unusual urethral foreign body for sexual gratification;Bedi N;JRSM Short Rep,2010
5. Delayed diagnosis of an intraurethral foreign body causing urosepsis and penile necrosis;Hwang EC;Korean J Urol,2010