Spengler, J. J. (1972). Population economics: Selected essays of Joseph John Spengler. Duke University Press.
Chicagoスタイル(17版)引用形式Spengler, Joseph John. Population Economics: Selected Essays of Joseph John Spengler. Durham, North Carolina: Duke University Press, 1972.
MLA(9版)引用形式Spengler, Joseph John. Population Economics: Selected Essays of Joseph John Spengler. Duke University Press, 1972.
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