@article{Shorter1971,
author = {Shorter, Edward and Knodel, John and Van De Walle, Etienne },
title= {The Decline of Non-Marital Fertility in Europe, 1880-1940},
year = {1971},
doi = {10.2307/2173074},
journal = {Population Studies},
volume = {25},
number = {3},
pages = {375--393},
}