English Language Services & English language services. (1964). English 900.: Book three. Macmillan.
芝加哥风格引文English Language Services 与 English language services. English 900.: Book Three. London: Macmillan, 1964.
MLA引文English Language Services 与 English language services. English 900.: Book Three. Macmillan, 1964.
警告：这些引文格式不一定是100％准确.