John L. Holland Class 1938, sur chsfomaha.org[lire en ligne]
counseling.org
Margaret M. Nauta, « The Development, Evolution, and Status of Holland’s Theory ofVocational Personalities: Reflections and Future Directionsfor Counseling Psychology », Journal of Counseling Psychology, vol. 57, no 1, , p. 11–22 (lire en ligne, consulté le ) [PDF].