Lobel, A. (1970). Frog and toad are friends. Harper, an imprint of HarperCollinsPublishers.
Citazione stile Chigago Style (17a edizione)Lobel, Arnold. Frog and Toad Are Friends. New York, NY: Harper, an imprint of HarperCollinsPublishers, 1970.
Citatione MLA (9a ed.)Lobel, Arnold. Frog and Toad Are Friends. Harper, an imprint of HarperCollinsPublishers, 1970.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.