Popper, D. (1900). 15 Easy studies: Preparatory to studies Opus 76 and 73 for cello. International Music.
Čikaški stil citiranja (17. izdanje)Popper, David. 15 Easy Studies: Preparatory to Studies Opus 76 and 73 for Cello. Nueva York: International Music, 1900.
MLA način citiranja (9. izdanje)Popper, David. 15 Easy Studies: Preparatory to Studies Opus 76 and 73 for Cello. International Music, 1900.
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