Verlag GmbH , 1947
Buku Referensi
Twomey, David P., author
Thomson Learning, 2002
Buku Teks
Sabato, Larry J.
Free Press , 1991
Buku Teks
Robby Permana Amri, author
Fakultas Hukum Universitas Indonesia, 2013
UI - Tesis (Membership)
Universitas Indonesia, 1991
UI - Skripsi (Membership)