Julia Burchell. (2021). Cambridge Lower Secondary English Stage 9: Workbook. Collins.
芝加哥风格引文Julia Burchell. Cambridge Lower Secondary English Stage 9: Workbook. London: Collins, 2021.
MLA引文Julia Burchell. Cambridge Lower Secondary English Stage 9: Workbook. Collins, 2021.
警告：这些引文格式不一定是100％准确.