Estes, S. (1986). Called to die: The story of American linguist chet bitterman, slain by terrorists. Grand Rapids.
Citazione stile Chigago Style (17a edizione)Estes, Steve. Called to Die: The Story of American Linguist Chet Bitterman, Slain by Terrorists. Michigan: Grand Rapids, 1986.
Citatione MLA (9a ed.)Estes, Steve. Called to Die: The Story of American Linguist Chet Bitterman, Slain by Terrorists. Grand Rapids, 1986.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.