Unknown. American Lyric Tenor and Composer Roland Hayes Performing on the Xavier University of Louisiana Campus.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Unknown. American Lyric Tenor and Composer Roland Hayes Performing on the Xavier University of Louisiana Campus.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Unknown. American Lyric Tenor and Composer Roland Hayes Performing on the Xavier University of Louisiana Campus.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.