Tohutoro APA (7th ed.)

Klengel, J. (1959). Technical studies for cello. International Music.

Tohutoru Kātū Chicago (17th ed.)

Klengel, Julius. Technical Studies for Cello. Nueva York: International Music, 1959.

Tohutoro MLA (9th ed.)

Klengel, Julius. Technical Studies for Cello. International Music, 1959.