@inbook{57684439, author={Richard P. Usatine and Mindy A. Smith and Heidi S. Chumley and E.J. Mayeaux Jr.}, title={Chapter 206. Erythema Annulare Centrifugum}, booktitle={The Color Atlas of Family Medicine, 2e}, publisher={The McGraw-Hill Companies}, address={New York, NY}, year={2013}, url={accessmedicine.mhmedical.com/content.aspx?aid=57684439} }