Turtledove, H. (2002). Counting up, counting down (first.). Ballantine books.
Citazione stile Chigago Style (17a edizione)Turtledove, Harry. Counting Up, Counting Down. first. New York: Ballantine books, 2002.
Citatione MLA (9a ed.)Turtledove, Harry. Counting Up, Counting Down. first. Ballantine books, 2002.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.