Schumacher, Michael, author
Writer's Digest Books, 1990
Buku Teks
Metha Ramadita, author
Fakultas Hukum Universitas Indonesia, 2018
UI - Tesis (Membership)
Orlik, Peter B., author
Allyn & Bacon, 1994
Buku Teks
Haslam, Sara, author
Routledge, 2009
Buku Teks
Roberts, Edgar V., author
Prentice-Hall, 1977
Koleksi Publik