Gills, J. F. (1979). The relationship between students' attitude toward high school and their academic achievement: A five year study. Northwestern University.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Gills, John Frederick. The Relationship Between Students' Attitude Toward High School and Their Academic Achievement: A Five Year Study. Chicago: Northwestern University, 1979.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Gills, John Frederick. The Relationship Between Students' Attitude Toward High School and Their Academic Achievement: A Five Year Study. Northwestern University, 1979.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.