APA-referens (7:e uppl.)

Ashbrook, P. (2003). Science is simple: Over 250 activities for preschoolers. Gryphon House.

Chicago-referens (17:e uppl.)

Ashbrook, Peggy. Science Is Simple: Over 250 Activities for Preschoolers. Beltsville, Md: Gryphon House, 2003.

MLA-referens (9:e uppl.)

Ashbrook, Peggy. Science Is Simple: Over 250 Activities for Preschoolers. Gryphon House, 2003.