Spokane Public Schools. Department of Music & Armstrong, R. F. (1951). Organization of the elementary string program: A handbook. Spokane Public Schools.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Spokane Public Schools. Department of Music و Robert F. Armstrong. Organization of the Elementary String Program: A Handbook. Spokane, Wash.: Spokane Public Schools, 1951.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Spokane Public Schools. Department of Music و Robert F. Armstrong. Organization of the Elementary String Program: A Handbook. Spokane Public Schools, 1951.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.