Weimer, David L.
Pearson Prentice Hall, 1989
Buku Teks SO
Weimer, David L.
Routledge, 2014
Buku Teks
Howlett, Michael
Oxford University Press, 2009
Buku Teks SO
Kluwer Academic Publishers, 2018
Majalah, Jurnal, Buletin
Dror, Yehezkel
Elsevier, 1978
Buku Teks SO