Cita APA (7th ed.)

Geist, E. (2009). Children are born mathematicians: Supporting mathematical development, birth to age 8. Merrill/Pearson.

Cita Chicago (17th ed.)

Geist, Eugene. Children Are Born Mathematicians: Supporting Mathematical Development, Birth to Age 8. Upper Saddle River, N.J: Merrill/Pearson, 2009.

Cita MLA (9th ed.)

Geist, Eugene. Children Are Born Mathematicians: Supporting Mathematical Development, Birth to Age 8. Merrill/Pearson, 2009.