(1981). 1981: Britannica book of the year. Encyclopaedia Britannica.
芝加哥风格引文1981: Britannica Book of the Year. Chicago: Encyclopaedia Britannica, 1981.
MLA引文1981: Britannica Book of the Year. Encyclopaedia Britannica, 1981.
警告：这些引文格式不一定是100％准确.
APA引文