Cita APA (7th ed.)

Siegler, R. S. (1998). Children's thinking (3rd ed.). Prentice Hall.

Cita Chicago (17th ed.)

Siegler, Robert S. Children's Thinking. 3rd ed. Upper Saddle River, N.J: Prentice Hall, 1998.

Cita MLA (9th ed.)

Siegler, Robert S. Children's Thinking. 3rd ed. Prentice Hall, 1998.