Gackle, L. (2011). Finding Ophelia's voice, opening Ophelia's heart: Nurturing the adolescent female voice : an exploration of the physiological, psychological, and musical development of female students. Heritage Music Press, a Lorenz Company.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Gackle, Lynne. Finding Ophelia's Voice, Opening Ophelia's Heart: Nurturing the Adolescent Female Voice : An Exploration of the Physiological, Psychological, and Musical Development of Female Students. Dayton, Ohio: Heritage Music Press, a Lorenz Company, 2011.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Gackle, Lynne. Finding Ophelia's Voice, Opening Ophelia's Heart: Nurturing the Adolescent Female Voice : An Exploration of the Physiological, Psychological, and Musical Development of Female Students. Heritage Music Press, a Lorenz Company, 2011.