1. Davidson, L., Bellamy, C., Guy, K., & Miller, R. (2012). Peer support among persons with severe mental illnesses: a review of the evidence. World Psychiatry, 11(2), 123–128.
Reference Point: In the abstract and introduction (p. 123), the authors describe how peer support services have been developed "as an adjunct to, and in some cases as an alternative to, traditional mental health services." This directly supports the language used in the correct answer.
DOI: https://doi.org/10.1002/j.2051-5545.2012.tb00105.x
2. Farkas, M., & Anthony, W. A. (Eds.). (2021). Psychiatric Rehabilitation (3rd ed.). Boston University, Center for Psychiatric Rehabilitation.
Reference Point: Chapter 10, "The Role of Peer Support in Psychiatric Rehabilitation," discusses the various models of peer support, including its integration into traditional service settings as well as its function in standalone, consumer-operated programs, illustrating its role as both an adjunct and an alternative.
3. Substance Abuse and Mental Health Services Administration (SAMHSA). (2023). What Are Peer Recovery Support Services? (Publication ID: PEP23-06-03-001).
Reference Point: This document outlines the various roles of peer workers and the settings in which they operate, including clinical and non-clinical environments. It states, "Peer support is a vital component of a recovery-oriented system of care," (p. 1) which inherently places it within the broader service system alongside professional services.