Percentage of 25- to 29-year-old High School Completers with Some College. US Department of Education.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Percentage of 25- to 29-year-old High School Completers with Some College. US Department of Education.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Percentage of 25- to 29-year-old High School Completers with Some College. US Department of Education.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.