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2. ; 1969. Patterns in the Use of Books in Large Research Libraries. Chicago and London: University of Chicago. 1969; p. 7.
3. 1965. “Quantitative Measure of User Circulation Requirements and Its Possible Effect on Stock Thinning and Multiple Copy Determination.” American Documentation. 1965 January; 16: 20–25.
4. Determining the Optimal Number of Volumes for a Library’s Core Collection
5. 1969. “User Circulation Satisfaction vs Size of Holdings at Three Academic Libraries.” College & Research Libraries. 1969 May; 30: 204–213.