1. Harmon, L. W., Hansen, J. C., Borgen, F. H. & Hammer, A. L. (1994). Strong Interest Inventory: Applications and technical guide. Palo Alto, CA: Consulting Psychologists Press.
2. Harrington, T. F. & O’Shea, A. J. (1980). The Harrington-O’Shea Career Decisionmaking System. Circle Pines, MN: American Guidance Service.
3. Harrington, T. F. & O’Shea, A. J. (1992). The Harrington-O’Shea Career Decisionmaking System Revised. Circle Pines, MN: American Guidance Service.
4. Harrington, T. F. & O’Shea, A. J. (2003). The Harrington-O’Shea Career Decisionmaking System Revised. Circle Pines, MN: American Guidance Service.
5. Hood, A. B. & Johnson, R. W. (1997). Assessment in counseling: A guide to the use of psychological assessment procedures (2nd ed.). Alexandria, VA: American Counseling Association.