King, Donald W., author
The evaluation of information services and products
Information Resources Press , 1971
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Crawford, John, author
Evaluation of library and information services
Aslib, 2000
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Access : Asia's Newspaper on Electronic Information Products & Services
iGroup (asia Pacific), 2006
 Majalah, Jurnal, Buletin
CICI directory of information products and services 1990
Longman, 1990
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Heldman, Robert K., author
Information telecommunications: networks, products and services/Robert K. Heldman
McGraw-Hill , 1994
 Buku Teks
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