Morris, Desmond, author
Jonathan Cape, 1969
Buku Teks
Clark, Wilfrid E. Le Gros, author
Holt, Rinehart and Winston, 1967
Buku Teks
Gill, Charles Burroughhs
John Wiley & Sons, 1980
Buku Teks
Jimmy Daniel Berlianto Oley, author
Komisi Pemberantasan Korupsi, 2018
Artikel Jurnal
Malott, Deane W., author
McGraw-Hill, 1939
Buku Teks