Roma Gans. (1996). How Do Birds Find Their Way? (Let's-Read-and-Find-Out Science 2). HarperCollins.
Chicago-viite (17. p.)Roma Gans. How Do Birds Find Their Way? (Let's-Read-and-Find-Out Science 2). HarperCollins, 1996.
MLA-viite (9. p.)Roma Gans. How Do Birds Find Their Way? (Let's-Read-and-Find-Out Science 2). HarperCollins, 1996.
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