Neukrug, Edward S., author
Cengage Learning, 2017
Buku Teks
Reichert, Elisabeth, author
Columbia University Press, 2003
Buku Teks
Seymour, James D., author
ME Sharpe, 1985
Buku Teks
Pihri Buhaerah, author
Kementerian Dalam Negeri RI, 2017
Artikel Jurnal
I.B. Tauris , 2000
Buku Teks