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Opitz JM, Smith JF, Santoro L (2008), «The FG syndromes (Online Mendelian Inheritance in Man 305450): perspective in 2008», Adv Pediatr55: 123-70, PMID19048730, doi:10.1016/j.yapd.2008.07.014.
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Opitz JM, Kaveggia EG (1974), «Studies of malformation syndromes of man XXXIII: the FG syndrome. An X-linked recessive syndrome of multiple congenital anomalies and mental retardation», Z Kinderheilkd117 (1): 1-18, PMID4365204, doi:10.1007/BF00439020.
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Opitz JM, Smith JF, Santoro L (2008), «The FG syndromes (Online Mendelian Inheritance in Man 305450): perspective in 2008», Adv Pediatr55: 123-70, PMID19048730, doi:10.1016/j.yapd.2008.07.014.