Grolier Limited. (1989). "Questions Kids Ask About Birds (Questions Kids Ask, 7)". Grolier Limited.
Lua i Stíl Chicago (17ú heag.)Grolier Limited. "Questions Kids Ask About Birds (Questions Kids Ask, 7)". Grolier Limited, 1989.
Lua MLA (9ú heag.)Grolier Limited. "Questions Kids Ask About Birds (Questions Kids Ask, 7)". Grolier Limited, 1989.
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