1.Hawke JL, Stallings MC, Wadsworth SJ, DeFries JC.(2008) DeFries-Fulker and Pearson-Aitken model-fitting analyses of reading performance data from selected and unselected twin pairs.
Behavioral Genets, 38(2), 101-107. PMID: 18213514
2. Wadsworth SJ, DeFries JC, Olson RK, Willcutt EG. (2007). Colorado longitudinal twin study of reading disability.
Ann Dyslexia, 57(2), 139-160. PMID: 18060583
3. Astrom RL, Wadsworth SJ, DeFries JC. (2007). Etiology of the stability of reading difficulties: the longitudinal twin study of reading disabilities.
Twin Res Hum Genet.,10(3), 434-9. PMID: 17564501