Abendlied & Märchenfarben :
for accordion ensemble, optional choir, and percussiongroup [sic] /
Per Nørgård.
APA Citation
Nørgård, P., Wölfli, A. (1990). Abendlied & Märchenfarben: for accordion ensemble, optional choir, and percussiongroup [sic]. Copenhagen: Edition W. Hansen.
MLA Citation
Nørgård, Per, 1932-, and Adolf Wölfli. Abendlied & Märchenfarben: for Accordion Ensemble, Optional Choir, And Percussiongroup [sic]. Copenhagen: Edition W. Hansen, 1990.
Warning: These citations may not always be complete (especially for serials).