Galam, Serge
Springer, 2012
eBooks
Grice, James W., author
Elsevier , 2011
Buku Teks
Little, Todd D, author
The Guilford Press, 2013
Buku Teks
Asher, Herbert B., author
Sage Publications, 1983
Buku Teks
Heck, Ronald H., author
Routledge, 2009
Buku Teks