Encyclopedia britanica. (1974). 1974 Britanica year book of sciences and the future. Helen hemingway.
Chicago Edition CitationEncyclopedia britanica. 1974 Britanica Year Book of Sciences and the Future. London: Helen hemingway, 1974.
MLA Edition CitationEncyclopedia britanica. 1974 Britanica Year Book of Sciences and the Future. Helen hemingway, 1974.
Warning: These citations may not always be 100% accurate.