Kovacs, M.L.
McGraw-Hill, 1975
Buku Teks
Castles, Stephen
Macmillan, 1993
Buku Teks
Heriyanto, author
Program Pascasarjana Universitas Indonesia, 2008
UI - Tesis (Open)
Angus and Robertson, 1971
Buku Teks
Sekretariat Jenderal DPR RI, 2015
Buku Referensi