Headstrom, R. (1972). Frogs, toads and salamander as pets. Ives Washburn.
Citazione stile Chigago Style (17a edizione)Headstrom, Richard. Frogs, Toads and Salamander as Pets. New York: Ives Washburn, 1972.
Citatione MLA (9a ed.)Headstrom, Richard. Frogs, Toads and Salamander as Pets. Ives Washburn, 1972.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.