The CaF Directory A definition of Smith-Magenis syndrome, its inheritance pattern, pre-natal diagnosis and a support group in the United Kingdom. http://www.cafamily.org.uk/Direct/s33.html

NORD: Smith Magenis Syndrome Offers the synonyms, a general discussion and further resources. http://www.rarediseases.org/search/rdbdetail_abstract.html?disname=Smith%20Lemli%20Opitz%20Syndrome

PRISMS (Parents and Researchers Interested in Smith-Magenis Syndrome) Details about the international support group organization and its mission as well as the condition. Includes an introduction, diagnosis, parent's corner, meet other people with SMS and educational considerations. http://www.prisms.org