Dyfyniad APA

Spengler, J. J. (1972). Population economics: Selected essays of Joseph John Spengler. Duke University Press.

Dyfyniad Arddull Chicago

Spengler, Joseph John. Population Economics: Selected Essays of Joseph John Spengler. Durham, North Carolina: Duke University Press, 1972.

Dyfyniad MLA

Spengler, Joseph John. Population Economics: Selected Essays of Joseph John Spengler. Duke University Press, 1972.

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