Software Testing Techniques, 1990 , Boris Beizer
Jones, Applied Software measurement.
Foundations of measurement, vol. 1: Additive and polynomial representations DH Krantz, RD Luce, P Suppes, A Tversky - New York: Academic, 1971
Pfanzagl, J. (1968). Theory of Measurement. New York: John Wiley & Sons.
Measurement: definitions and theories CW Churchman, P Ratoosh - 1959 - Wiley, New York
Theory and methods of scaling (Unknown Binding) by Warren S Torgerson