Sams, Eric (1969–1970). "The Tonal Analogue in Schumann's Music". Proceedings of the Royal Musical Association. 96: 103–117. doi:10.1093/jrma/96.1.103. JSTOR765977.
Neumeyer, David (Autumn 1987). "The Ascending "Urlinie"". Journal of Music Theory. 31 (2): 275–303. doi:10.2307/843711. JSTOR746155.
jstor.org
Sams, Eric (1969–1970). "The Tonal Analogue in Schumann's Music". Proceedings of the Royal Musical Association. 96: 103–117. doi:10.1093/jrma/96.1.103. JSTOR765977.