Nystrom, C., & Speidel, S. (2007). Before I was born: Designed for parents to read with children ages 5 to 8 (Rev. and updated.). NavPress.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Nystrom, Carolyn, و Sandra Speidel. Before I Was Born: Designed for Parents to Read with Children Ages 5 to 8. Rev. and updated. Colorado Springs, Colo.: NavPress, 2007.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Nystrom, Carolyn, و Sandra Speidel. Before I Was Born: Designed for Parents to Read with Children Ages 5 to 8. Rev. and updated. NavPress, 2007.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.