YAM, P. (2012). PRIMARY LEVEL COMPLETE VOCABULARY (1st.). SAP GROUP.
芝加哥风格引文YAM, PETER. PRIMARY LEVEL COMPLETE VOCABULARY. 1st. SINGAPORE: SAP GROUP, 2012.
MLA引文YAM, PETER. PRIMARY LEVEL COMPLETE VOCABULARY. 1st. SAP GROUP, 2012.
警告：这些引文格式不一定是100％准确.