Klengel, J. 2 pieces (1. Humoresque; 2. Serenade), opus 5, for four cellos. International Music.
芝加哥风格引文Klengel, Julius. 2 Pieces (1. Humoresque; 2. Serenade), Opus 5, for Four Cellos. New York: International Music.
MLA引文Klengel, Julius. 2 Pieces (1. Humoresque; 2. Serenade), Opus 5, for Four Cellos. International Music.
警告：这些引文格式不一定是100％准确.