Judy Hawes. (2000). Why Frogs Are Wet (Let's-Read-and-Find-Out Science 2). HarperCollins.
Čikaški stil citiranja (17. izdanje)Judy Hawes. Why Frogs Are Wet (Let's-Read-and-Find-Out Science 2). HarperCollins, 2000.
MLA način citiranja (9. izdanje)Judy Hawes. Why Frogs Are Wet (Let's-Read-and-Find-Out Science 2). HarperCollins, 2000.
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