Russel, K., & Carter, P. (1999). Classic Conundrums: Fiendish puzzles from the 19th Century. Barners & Noble Inc.
Citazione stile Chigago Style (17a edizione)Russel, Kenneth, e Philip Carter. Classic Conundrums: Fiendish Puzzles from the 19th Century. New York: Barners & Noble Inc, 1999.
Citatione MLA (9a ed.)Russel, Kenneth, e Philip Carter. Classic Conundrums: Fiendish Puzzles from the 19th Century. Barners & Noble Inc, 1999.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.