@book{Lillard2003,
author = {Lillard, L.A. and Panis, C.W.A. },
title= {Multilevel multiprocess modeling. aML Version 2. User’s guide and reference manual},
year = {2003},
URL = {http://www.applied-ml.com/
%[21 March 2014},
address = {Los Angeles},
publisher = {EconWare},
}