Analysis of information sources in references of the Wikipedia article "Perang Salib Pertama" in Indonesian language version.
 Löffler, Klemens (1912). . Dalam Herbermann, Charles (ed.). Catholic Encyclopedia. Vol. 13. New York: Robert Appleton Company.
 Löffler, Klemens (1912). . Dalam Herbermann, Charles (ed.). Catholic Encyclopedia. Vol. 13. New York: Robert Appleton Company.