Harrigan, Jane
Ashgate, 2001
Buku Teks
Adry Gracio
2017
UI - Skripsi (Membership)
Hardiyansyah
Research and Development Agency Ministry of Home Affairs, 2018
Artikel Jurnal
Pressat, Roland
Aldine Publ., 1980
Buku Teks
Gumilar Rusliwa Somantri
Universitas Indonesia. Lembaga Penelitian, 1993
UI - Laporan Penelitian