Toronto Mail Order Staff. (1990). "Questions Kids Ask About This and That (Questions Kids Ask, 27)". Grolier Limited.
Chicago-viite (17. p.)Toronto Mail Order Staff. "Questions Kids Ask About This and That (Questions Kids Ask, 27)". Grolier Limited, 1990.
MLA-viite (9. p.)Toronto Mail Order Staff. "Questions Kids Ask About This and That (Questions Kids Ask, 27)". Grolier Limited, 1990.
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