21 modern etudes :
for the double bass /
Frank Proto.
APA Citation
Proto, F. (1984). 21 modern etudes: for the double bass. Cincinnati, Ohio: Liben Music.
MLA Citation
Proto, Frank. 21 Modern Etudes: for the Double Bass. Cincinnati, Ohio: Liben Music, 1984.
Warning: These citations may not always be complete (especially for serials).