APA (7th ed.) Citation

Sarah Williamson, M., Julie Iacullo, M., & Harry Winfield, M. Punched-out gluteal and perianal ulcerations. Elsevier.

Chicago Style (17th ed.) Citation

Sarah Williamson, MD, MD Julie Iacullo, and MD Harry Winfield. Punched-out Gluteal and Perianal Ulcerations. Elsevier.

MLA (9th ed.) Citation

Sarah Williamson, MD, et al. Punched-out Gluteal and Perianal Ulcerations. Elsevier.

Warning: These citations may not always be 100% accurate.