(1970). 1971 Britannica yearbooks of science and the future. Encyclopaedia Britannica.
シカゴスタイル引用形1971 Britannica Yearbooks of Science and the Future. Chicago: Encyclopaedia Britannica, 1970.
MLA引用形式1971 Britannica Yearbooks of Science and the Future. Encyclopaedia Britannica, 1970.
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