Estes, S. (1986). Called to die: The story of American linguist chet bitterman, slain by terrorists. Grand Rapids.
Lua i Stíl Chicago (17ú heag.)Estes, Steve. Called to Die: The Story of American Linguist Chet Bitterman, Slain by Terrorists. Michigan: Grand Rapids, 1986.
Lua MLA (9ú heag.)Estes, Steve. Called to Die: The Story of American Linguist Chet Bitterman, Slain by Terrorists. Grand Rapids, 1986.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.