Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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