Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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