1. American Psychiatric Association (2013). Diagnostic and statistical manual of mental disorders (5th ed.). Washington, DC: Author.
2. Barth, K. (1963). The preaching of the gospel (trans: Hooke, B.E.). Philadelphia: Westminster Press. (Original work published 1961).
3. Barth, K. (1995). The theology of John Calvin (trans: Bromiley, G.W.). Grand Rapids: William B. Eerdmans Publishing. (Original work published 1922).
4. Byars, R. P. (2000). Christian worship: Glorifying and enjoying god. Louisville: Geneva Press.
5. Byars, R. P. (2014). Come and see: Presbyterian congregations celebrating weekly communion. Eugene: Cascade Books.