Erwin, J. (2012). A Scale in Time: Scales, chorales, studies, basic improvisation, alternative styles ; for the development of technical skills and improved intonation / Joanne Erwin (Conductor Score.). FJH Music Co..
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Erwin, Joanne. A Scale in Time: Scales, Chorales, Studies, Basic Improvisation, Alternative Styles ; for the Development of Technical Skills and Improved Intonation / Joanne Erwin. Conductor Score. Fort Lauderdale, Fla.: FJH Music Co., 2012.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Erwin, Joanne. A Scale in Time: Scales, Chorales, Studies, Basic Improvisation, Alternative Styles ; for the Development of Technical Skills and Improved Intonation / Joanne Erwin. Conductor Score. FJH Music Co., 2012.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.