Citazione Stile APA (7a Edizione)
Heilig, G., Büttner, T., & Lutz, W. (1991). Germany's Population: Turbulent Past, Uncertain Future (1. Aufl.). International Institute for Applied Systems Analysis.
Citazione stile Chigago Style (17a edizione)
Heilig, Gerhard, Thomas Büttner, e Wolfgang Lutz. Germany's Population: Turbulent Past, Uncertain Future. 1. Aufl. Laxenburg: International Institute for Applied Systems Analysis, 1991.
Citatione MLA (9a ed.)
Heilig, Gerhard, et al. Germany's Population: Turbulent Past, Uncertain Future. 1. Aufl. International Institute for Applied Systems Analysis, 1991.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.