Cita APA (7th ed.)

Liebert, R. M., & Poulos, R. W. (1977). Developmental psychology (4th ed.). Prentice-Hall.

Cita Chicago (17th ed.)

Liebert, Robert M., i Rita Wicks Poulos. Developmental Psychology. 4th ed. New Jersey: Prentice-Hall, 1977.

Cita MLA (9th ed.)

Liebert, Robert M., i Rita Wicks Poulos. Developmental Psychology. 4th ed. Prentice-Hall, 1977.