R. E. Tipton, R. J. Gorlin: Growth retardation, alopecia, pseudo-anodontia, and optic atrophy–the GAPO syndrome: report of a patient and review of the literature. In: American Journal of Medical Genetics, Band 19, Nr. 2, Oktober 1984, S. 209–216, doi:10.1002/ajmg.1320190202, PMID 6507471.
R. E. Tipton, R. J. Gorlin: Growth retardation, alopecia, pseudo-anodontia, and optic atrophy–the GAPO syndrome: report of a patient and review of the literature. In: American Journal of Medical Genetics, Band 19, Nr. 2, Oktober 1984, S. 209–216, doi:10.1002/ajmg.1320190202, PMID 6507471.