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References
1.
L. Brummel
and
E. Egger
: Guide to union catalogues and international loan centres . The Hague : Nijhoff , 1961 . p 78 ;
2.
Valentin Wehefritz, ed.: International loan services and union catalogues. Frankfurt:
3.
Klostermann, 1974 (Zeitschrift für Bibliothekswesen und Bibliographie, Sonderheft 17). p 8.
4.
Frank L. Schick
: "The international standardization of library statistics ", Unesco bulletin for libraries , 25 (1 ) Jan-Feb 1971 : pp. 2 -11 .
5.
Ibid.: pp. 7-11.
6.
Wehefritz, op. cit., p. 24.