@inbook{Tattersall1996,
author = {Tattersall, J.},
title= {How many people ever lived?},
year = {1996},
editor = {Callinger, R.},
booktitle = {Vita Mathematica: Historical Research and Integration with Teaching},
address = {New York},
publisher = {Mathematical Association of America, MAA Notes Series \#40},
pages = {331--337},
}