Lynn, Richard (2001): . Praeger Publishers. ISBN 9780275958220. Lynn, Richard; Vanhanen, Tatu (2002): . Westport, Connecticut: Praeger. ISBN 9780275975104. Lynn, Richard ([1996] 2011): . Praeger Publishers. ISBN 9780275949174. Lynn, Richard; Vanhanen, Tatu (2012): . Ulster: Ulster Institute for Social Research. ISBN 9780956881175.