The genetic and environmental etiologies of individual differences in early reading growth in Australia, the United States, and Scandinavia.
Christopher ME, Hulslander J, Byrne B, Samuelsson S, Keenan JM, Pennington B, Defries JC, Wadsworth SJ, Willcutt E, Olson RK. The genetic and environmental etiologies of individual differences in early reading growth in Australia, the United States, and Scandinavia. J Exp Child Psychol. 2013 Jul; 115(3):453-67.