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International Association of School Libraranship, 2002
Buku Teks
Gardner, D.H.
New York: Institute of Pasific Relations, 1950
Buku Teks
Pergamon Press, 1980
Buku Teks
McDonald, Stephen L.
The Brookings Institution , 1963
Buku Teks
edited by Lewis M. Alexander
University of Rhode Island, 1972
Buku Teks