Ashbrook, P. (2003). Science is simple: Over 250 activities for preschoolers. Gryphon House.
芝加哥风格引文Ashbrook, Peggy. Science Is Simple: Over 250 Activities for Preschoolers. Beltsville, Md: Gryphon House, 2003.
MLA引文Ashbrook, Peggy. Science Is Simple: Over 250 Activities for Preschoolers. Gryphon House, 2003.
警告：这些引文格式不一定是100％准确.