Rhythmical problems :
special studies for the mastery of differently divided rhythmic groups, occurring either simultaneously or in succession : systematically arranged with explanatory text for piano instruction/
Heinrich Germer.
APA Citation
Germer, H. (1901). Rhythmical problems: special studies for the mastery of differently divided rhythmic groups, occurring either simultaneously or in succession : systematically arranged with explanatory text for piano instruction. New York: G. Schirmer.
MLA Citation
Germer, Heinrich, 1837-1913. Rhythmical Problems: Special Studies for the Mastery of Differently Divided Rhythmic Groups, Occurring Either Simultaneously Or In Succession : Systematically Arranged With Explanatory Text for Piano Instruction. New York: G. Schirmer, 1901.
Warning: These citations may not always be complete (especially for serials).