Hopley, C. C. Snakes: Curiosities and Wonders of Serpent Life.
Citazione stile Chigago Style (17a edizione)Hopley, Catherine Cooper. Snakes: Curiosities and Wonders of Serpent Life.
Citatione MLA (9a ed.)Hopley, Catherine Cooper. Snakes: Curiosities and Wonders of Serpent Life.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.