Παραπομπή σε μορφή APA (7η εκδ.)

Spengler, J. J. (1975). Zero population growth: Implications. Carolina Population Center, University of North Carolina at Chapel Hill.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Spengler, Joseph John. Zero Population Growth: Implications. Chapel Hill: Carolina Population Center, University of North Carolina at Chapel Hill, 1975.

Παραπομπή σε μορφή MLA (9th εκδ.)

Spengler, Joseph John. Zero Population Growth: Implications. Carolina Population Center, University of North Carolina at Chapel Hill, 1975.