James Ertel. (1981). Encyclopaedia Britannica 1981 Book of the Year (1st.). Encyclopaedia Britannnica, Inc..
Chicago Edition CitationJames Ertel. Encyclopaedia Britannica 1981 Book of the Year. 1st. Chicago: Encyclopaedia Britannnica, Inc., 1981.
MLA Edition CitationJames Ertel. Encyclopaedia Britannica 1981 Book of the Year. 1st. Encyclopaedia Britannnica, Inc., 1981.
Warning: These citations may not always be 100% accurate.