Publications
We highly recommend these must have, must read books and other publications about circumplex models and instruments, as well as leadership research.
Leary, T. (1957). Interpersonal diagnosis of personality: A functional theory and methodology for personality evaluation. New York: Ronald.
Horowitz, L.M., & Strack, S. (2011). Handbook of interpersonal psychology. Theory, research, assessment and therapeutic interventions. New Jersey: Wiley.
Vermeren, P. (2014). Around leadership: Bridging the scientist-practitioner gap. Melbourne: Around Publishing. (Dutch and French versions available; English in print, available early 2014).
Wiggins, J.S. (2003). Paradigms of personality assessment. New York: Guilford.
In addition, the links below will give you more options to explore.
Recommended Readings about Leadership Research
Research on Circumplex Models, Instruments, and Interpersonal Theory