Cita APA (7th ed.)

Liebert, R. M., & Wicks-Nelson, R. (1981). Developmental psychology (3d ed.). Prentice-Hall.

Cita Chicago (17th ed.)

Liebert, Robert M., i Rita Wicks-Nelson. Developmental Psychology. 3d ed. Englewood Cliffs, N.J: Prentice-Hall, 1981.

Cita MLA (9th ed.)

Liebert, Robert M., i Rita Wicks-Nelson. Developmental Psychology. 3d ed. Prentice-Hall, 1981.