Gaya APA

Armstrong, K. (1991). Holy war : the crusades and their impact on today's world / Karen Armstrong . New York: Doubleday, 1991: New York: Doubleday, 1991.

Gaya MLA

Armstrong, Karen. "Holy war : the crusades and their impact on today's world / Karen Armstrong". New York: Doubleday, 1991: New York: Doubleday, 1991, 1991. Text.