1. Diseases of the penis and prepuce;Carson,1993
2. Inabilityto BreedDue toInjuryorAbnormalityof theExternalGenitaliaof Bulls;Maxwell;Bovine Reproduction,2021
3. Persistent penile frenulum in bulls;Carroll;J Am Vet Med Assoc,1964
4. Juvenile anomalies of the penis and prepuce: bulls;Wolfe,1999
5. Development of penis and sheath in the bull calf;Ashdown;J Agric Sci,1960