http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Foundations of inference in survey sampling
Claes-Magnus Cassel, Carl-Erik Särndal, Jan Håkan Wretman.
Περιλαμβάνει βιβλιογραφία και ευρετήριο.
Wiley series in probability and mathematical statistics