1. A View of Schoenberg’s Op. 19, No. 2;Williams;College Music Symposium,1985
2. Weytjens, Stephan . “Text as a Crutch in Arnold Schoenberg’s ‘Pierrot lunaire’ Op. 21?” PhD dissertation, University of Leuven, 2003.
3. Concepts of Harmony and Prolongation in Schoenberg's Op. 19/2