Amidhan, author
Lembaga Pangkajian MPR RI, 2019
Artikel Jurnal
Edward, David V.
Prentice-Hall, 1982
Buku Teks
Friedrich, Carl Joachim
McGraw-Hill, 1963
Buku Teks
Valeska Liviani Priadi, author
Universitas Indonesia, 2013
UI - Skripsi (Membership)
Eduardo Kukila Aji, author
2010
UI - Skripsi (Open)