Ferguson, G. W. (1955). A comparison of athlete's grade point averages with those of non-athletes with similar intelligence quotients.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ferguson, Gerald W. A Comparison of Athlete's Grade Point Averages with Those of Non-athletes with Similar Intelligence Quotients. 1955.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Ferguson, Gerald W. A Comparison of Athlete's Grade Point Averages with Those of Non-athletes with Similar Intelligence Quotients. 1955.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.