ENGELS, F. (1950). Socialism: Utopian and scientific. Allen & Unwin.
Chicagoスタイル(17版)引用形式ENGELS, Frederick. Socialism: Utopian and Scientific. London: Allen & Unwin, 1950.
MLA(9版)引用形式ENGELS, Frederick. Socialism: Utopian and Scientific. Allen & Unwin, 1950.
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