MacGilchrist, Claire (2020). "3. The skin and nails in podiatry". In Burrow, J. Gordon; Rome, Keith; Padhiar, Nat (eds.). Neale's Disorders of the Foot and Ankle (به انگلیسی) (9th ed.). Elsevier. p. 52. ISBN978-0-7020-6504-0.
James, William D.; Elston, Dirk; Treat, James R.; Rosenbach, Misha A.; Neuhaus, Isaac (2020). "33. Diseases of the skin appendages". Andrews' Diseases of the Skin: Clinical Dermatology (به انگلیسی) (13th ed.). Edinburgh: Elsevier. p. 782. ISBN978-0-323-54753-6.