1. Observations on an ethnic classification of idiots. Clinical Lecture Reports;Down;London Hosp,1866
2. Esquemas clínico visuales en pediatría,1996
3. Jones KL. Smith's recognizable patterns of human malformation. 5th ed. Philadelphia: Saunders, 997; p. 8-13
4. Syndromes of the head and neck;Gorlin,1990
5. Cardiopatías congénitas en el síndrome de Down;Rodríguez;Bol Med Hosp Infant Mex,1984