@inbook{Kreager2003,
author = {Kreager, P.},
title= {Population thought, history of},
year = {2003},
editor = {Demeny, P.G.},
editor = {McNicoll, G.},
booktitle = {Encyclopedia of population},
address = {New York},
publisher = {Macmillan Reference USA},
pages = {772--785},
}