Amsterdam : Elsevier Science Publishers
Majalah, Jurnal, Buletin
Hogan, Patrick Colm, author
Routledge, 2005
Buku Teks
Spaan, Ernst
University of Leiden, 1989
Buku Teks
Kesavarajah Mayandy, author
Bank Indonesia Institute, 2019
Artikel Jurnal
Tubingen : Federal Republic of Germany
Majalah, Jurnal, Buletin