Cita APA (7a ed.)

Lansdown, R., & Walker, M. G. (1991). Your child's development: From birth to adolescence. Alfred A. Knopf.

Cita Chicago Style (17a ed.)

Lansdown, Richard, y Marjorie G. Walker. Your Child's Development: From Birth to Adolescence. New York: Alfred A. Knopf, 1991.

Cita MLA (9a ed.)

Lansdown, Richard, y Marjorie G. Walker. Your Child's Development: From Birth to Adolescence. Alfred A. Knopf, 1991.