Response to Early Literacy Instruction in the United States, Australia and Scandinavia : A behavioural - genetic analysis.  Stefan Samuelsson, Brian Byrne,  Richard K. Olson, Jacqueline Hulslander, Sally Wadsworth, Robin Corley, Erik G. Willcutt, John C. DeFries

Teacher Effects in Early Literacy Development: Evidence from a Study of Twins.  Brian Byrne, William L Coventry, Richard K Olson, Sally J Wadsworth, Stefan Samuelsson, Stephen A Petrill