(1981). 1981: Britannica book of the year. Encyclopaedia Britannica.
Chicagoスタイル(17版)引用形式1981: Britannica Book of the Year. Chicago: Encyclopaedia Britannica, 1981.
MLA(8版)引用形式1981: Britannica Book of the Year. Encyclopaedia Britannica, 1981.
警告: この引用は必ずしも正確ではありません.