Bishop, D. (2005). DeFries-Fulker analysis of twin data with skewed distributions: Cautions and recommendations from a study of children's use of verb inflections. Springer Science and Business Media, LLC.

Bishop, D. DeFries-Fulker Analysis of Twin Data with Skewed Distributions: Cautions and Recommendations from a Study of Children's Use of Verb Inflections. Springer Science and Business Media, LLC, 2005.

Bishop, D. DeFries-Fulker Analysis of Twin Data with Skewed Distributions: Cautions and Recommendations from a Study of Children's Use of Verb Inflections. Springer Science and Business Media, LLC, 2005.