Ashbrook, P. (2003). Science is simple: Over 250 activities for preschoolers. Gryphon House.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAshbrook, Peggy. Science Is Simple: Over 250 Activities for Preschoolers. Beltsville, Md: Gryphon House, 2003.
एमएलए (9वां संस्करण) प्रशस्ति पत्रAshbrook, Peggy. Science Is Simple: Over 250 Activities for Preschoolers. Gryphon House, 2003.
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