William, R.
Elseiver, 2012
Buku Teks
Williams, R. Tee
Elsevier , 2011
Buku Teks
Saunders, Anthony
McGraw-Hill Education, 2015
Buku Teks
Universitas Indonesia, 2006
UI - Skripsi (Membership)
Aria Suyudi
Fakultas Hukum Universitas Indonesia, 1999
UI - Skripsi (Membership)