of Value and Valuation: Theory and Applications. Lanham, Md., University Press of America, 1991 Hartman, Robert S., Freedom to Live, (Arthur R. Ellis, editor), Atlanta: Rodopi Editions, Value Inquiry Book Series, 1984, reissued 1994 Hartman, Robert S., "Axiometric Structure of Intrinsic Value", Journal of Value Inquiry (Summer, 1974; v.8, no. 2, pp. 88–101 Katz, Marvin C., Sciences of Man and Social Ethics, Boston, 1969, esp. pp. 9–45, 101–123. Katz, Marvin C., Trends Towards Synthesis in the Philosophy of Robert S. Hartman, Muskegon: Axiopress (142 pages 2004). External links Hartman Institute Axiometrics International, Incorporated--30 years of applied research Center for Applied AxioMetrics How intangible values can actually be measured Value Insights-What is Value Science? Axiology