Artikel Jurnal
Tung Desem Waringin
Gramedia Pustaka Utama, 2005
Buku Teks
edited by Martin Fransman, Gerd Junne and Annemieke Roobeek
Blackwell, 1995
Buku Teks SO
Carr, Edward Hallet
Macmillan, 1950
Buku Teks
Toynbee, Arnold J.
The Beacon Press , 1961
Buku Teks SO