Grolier Limited. (1989). "Questions Kids Ask About Birds (Questions Kids Ask, 7)". Grolier Limited.
Cita Chicago Style (17a ed.)Grolier Limited. "Questions Kids Ask About Birds (Questions Kids Ask, 7)". Grolier Limited, 1989.
Cita MLA (9a ed.)Grolier Limited. "Questions Kids Ask About Birds (Questions Kids Ask, 7)". Grolier Limited, 1989.
Precaución: Estas citas no son 100% exactas.