1. American Psychiatric Association. (1968). Diagnostic and statistical manual of mental disorders (2nd ed.). Washington, DC: Author.
2. American Psychiatric Association. (1994). Diagnostic and statistical manual of mental disorders (4th ed. Text revision). Washington, DC: Author.
3. American Psychiatric Association. (2013). Diagnostic and statistical manual of mental disorders (5th ed.). Washington, DC: Author.
4. American Psychological Association (APA), Center for Organizational Excellence. (2014). Creating a psychologically healthy workplace. Retrieved from Resources for Employers Website
http://www.apaexcellence.org/resources/creatingahealthyworkplace/
.
5. American Psychological Association. (1976). Contributions of psychology to health research. The American Psychologist, 31, 263–273.
https://doi.org/10.1037/0003-066X.31.4.263
.