@inbook{Piccinino1999,
author = {Piccinino, L. and Peterson, L.S.  },
title= {Ambivalent attitudes and unintended pregnancy},
year = {1999},
editor = {Severy, L.S.},
editor = {Miller, W.B. },
booktitle = {Advances in population: Psychosocial perspectives, Vol. 3},
address = {London},
publisher = {Jessica Kingsley Publishers},
pages = {227--249},
}