APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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

Let op: Deze citaties zijn niet altijd 100% accuraat.