1V. E. Palmour, C. B. Marcia, R. V. Robert. Costs of Owning, Borrowing, and Disposing of Periodical Publications Arlington, VA: Center for Naval Analysis, 1977.
2M. Getz. Economics: Document Delivery. The Bottom Line, 1991--92(5).
3M. Getz. Economice: Increasing the value of user Time.The Bottom Line, 1987, 1(2).
4B. P. Schauer. The Economics of Managing Library Service. Chicago and London: ASIS, 1990.
