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  1. Lever, A.J.: ¬Een basisclassificatie in ontwikkeling : naar coördinatie van de collectievorming en gemeenschappelijke onderwerpsontsluiting bij wetenschappelijke bibliotheken (1988) 10.29
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    Author
    Lever, A.J.
  2. Lever, A.J.: Nederlandse basisklassificatie gereed (1989) 10.29
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  3. Lever, A.J.: BC veelzijdig instrument : gebruiksmogelijkheden van de Nederlandse Basisclassificatie (1994) 10.29
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    Lever, A.J.