Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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