Wakefield, J. C. (1992). The concept of mental disorder: On the boundary between biological facts and social values. American Psychologist, 47(3), 373–388. https://doi-org.saintleo.idm.oclc.org/10.1037/0003-066X.47.3.373
Frey, R. J., & Caffrey, C. (2016). Developmental psychology. In Gale (Ed.), Gale encyclopedia of children's health: Infancy through adolescence (3rd ed.). Farmington, MI: Gale.