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.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)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.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)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.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.