Checkley, K. (2008). The essentials of social studies, grades K-8: Effective curriculum, instruction, and assessment. Association for Supervision and Curriculum Development.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Checkley, Kathy. The Essentials of Social Studies, Grades K-8: Effective Curriculum, Instruction, and Assessment. Alexandria, Va.: Association for Supervision and Curriculum Development, 2008.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Checkley, Kathy. The Essentials of Social Studies, Grades K-8: Effective Curriculum, Instruction, and Assessment. Association for Supervision and Curriculum Development, 2008.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.