- NORD: Smith Magenis Syndrome - Offers the synonyms, a general discussion and further resources.
- 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.
- The CaF Directory - A definition of Smith-Magenis syndrome, its inheritance pattern, pre-natal diagnosis and a support group in the United Kingdom.
