Smith, E. A.; Senter, R. J. (1967). "Automated Readability Index". Amrl-Tr. Aerospace Medical Research Laboratories (U.s.). Wright-Patterson Air Force Base: 1–14. PMID5302480. AMRL-TR-6620. Archived from the original on 2013-07-09. Retrieved 2012-03-18.
Smith, E. A.; Senter, R. J. (1967). "Automated Readability Index". Amrl-Tr. Aerospace Medical Research Laboratories (U.s.). Wright-Patterson Air Force Base: 1–14. PMID5302480. AMRL-TR-6620. Archived from the original on 2013-07-09. Retrieved 2012-03-18.
Smith, E. A.; Senter, R. J. (1967). "Automated Readability Index". Amrl-Tr. Aerospace Medical Research Laboratories (U.s.). Wright-Patterson Air Force Base: 1–14. PMID5302480. AMRL-TR-6620. Archived from the original on 2013-07-09. Retrieved 2012-03-18.