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Langfeldt, J.: Zum Problem und zur Geschichte der Systematik : T.1-2. (1957)
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- Source
- Bücherei und Bildung. 9(1957), S.465-473, 519-527
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Langfeldt, J.: Systematik und Index des Realkatalogs der Stadtbücherei Bochum (1949)
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Langfeldt, J.: Über den Schlagwortkatalog der belehrenden Literatur (1930)
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- Source
- Bücherei und Bildungspflege. 10(1930), S.307-323