Cita APA (7th ed.)

Liebert, R. M., & Poulos Wicks Rita. Developmental psychology. Prentice-Hall.

Cita Chicago (17th ed.)

Liebert, Robert M., i Poulos Wicks Rita. Developmental Psychology. New Jersey: Prentice-Hall.

Cita MLA (9th ed.)

Liebert, Robert M., i Poulos Wicks Rita. Developmental Psychology. Prentice-Hall.