Herr, E. L., Cramer, S. H., & Niles, S. G. Career guidance and counseling through the lifespan—Systematic approaches (6th ed.).

Herr, E. L., Cramer, S. H., & Niles, S. G. Career guidance and counseling through the lifespan—Systematic approaches (6th ed.). (2007). Revue Canadienne De Counseling Et De psychothérapie, 38(2). https://jmss.org/index.php/rcc/article/view/59196