APA-viite (7. p.)

Klengel, J. 2 pieces (1. Humoresque; 2. Serenade), opus 5, for four cellos. International Music.

Chicago-viite (17. p.)

Klengel, Julius. 2 Pieces (1. Humoresque; 2. Serenade), Opus 5, for Four Cellos. New York: International Music.

MLA-viite (9. p.)

Klengel, Julius. 2 Pieces (1. Humoresque; 2. Serenade), Opus 5, for Four Cellos. International Music.