Research methods in librarianship : techniques and interpretation: C.H. Busha and S.P. Harter. New York: Academic Press, 1980
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[1] Michael Halperin. Measuring Students' Preferences for Reference Service: A Conjoint Analysis , 1980, The Library Quarterly.
[2] Alan J. Mayne,et al. Measurement and Modelling Methods for Computer System Performance Studies , 1979 .