(1996). Singer's world: Book 4 : for high voice. Trinity College London.
芝加哥风格引文Singer's World: Book 4 : For High Voice. London: Trinity College London, 1996.
MLA引文Singer's World: Book 4 : For High Voice. Trinity College London, 1996.
警告：这些引文格式不一定是100％准确.