Cita APA (7th ed.)

Cook, J. L., & Cook, G. (2007). The world of children. Pearson.

Cita Chicago (17th ed.)

Cook, Joan Littlefield, i Greg Cook. The World of Children. Boston: Pearson, 2007.

Cita MLA (8th ed.)

Cook, Joan Littlefield, i Greg Cook. The World of Children. Pearson, 2007.