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Gaya APA

Spencer, J, F. (2007). Science Month by Month Grade 3-8: Practical Ideas and Activities for Teachers and Homeschollers . USA: John Wiley & Sons, Inc.

Gaya MLA

Spencer, Julia, Farish. "Science Month by Month Grade 3-8: Practical Ideas and Activities for Teachers and Homeschollers". USA: John Wiley & Sons, Inc, 2007. Text.