Li، B.؛ Mahan، C. M.؛ Kang، H. K.؛ Eisen، S. A.؛ Engel، C. C. (2011). "Longitudinal Health Study of US 1991 Gulf War Veterans: Changes in Health Status at 10-Year Follow-up". American Journal of Epidemiology. ج. 174 ع. 7: 761–768. DOI:10.1093/aje/kwr154. PMID:21795757.
Li، B.؛ Mahan، C. M.؛ Kang، H. K.؛ Eisen، S. A.؛ Engel، C. C. (2011). "Longitudinal Health Study of US 1991 Gulf War Veterans: Changes in Health Status at 10-Year Follow-up". American Journal of Epidemiology. ج. 174 ع. 7: 761–768. DOI:10.1093/aje/kwr154. PMID:21795757.