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Lever, A.J.: Nederlandse basisklassificatie gereed (1989)
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- Source
- Open. 21(1989), S.170-172
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Lever, A.J.: ¬Een basisclassificatie in ontwikkeling : naar coördinatie van de collectievorming en gemeenschappelijke onderwerpsontsluiting bij wetenschappelijke bibliotheken (1988)
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- Source
- Open. 20(1988), S.210-213
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Lever, A.J.: BC veelzijdig instrument : gebruiksmogelijkheden van de Nederlandse Basisclassificatie (1994)
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- Source
- Open. 26(1994) no.5, S.165-168