Yell, Mitchell L.
Prentice-Hall, 1998
Buku Teks
Severinghaus, Aura E., author
McGraw-Hill , 1953
Buku Teks
Rika Irdayanti, author
Fakultas Hukum Universitas Indonesia, 2013
UI - Tesis (Membership)
Jossey-Bass, 2009
Buku Teks
University of Chicago Press, 1988
Buku Teks