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Belkin, N.J.; Croft, W.B.: Retrieval techniques (1987)
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- Annual review of information science and technology. 22(1987), S.109-145
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Williamson, N.J.: Subject cataloguing in Canada (1982)
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Williamson, N.J.: ¬The Library of Congress Classification : problems and prospects in online retrieval (1986)
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Belkin, N.J.: Ineffable concepts in information retrieval (1981)
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Williamson, N.J.: ¬The role of classification in online systems (1989)
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Williamson, N.J.: ¬An experiment in classification based on William Goffman's 'indirect method' of information retrieval (1981)
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