Reihe Textbooks for Knowledge Organization WissensorganisationEntwicklung, Aufgabe, Anwendung, ZukunftIngetraut DahlbergErgonSoftcover2014 Classificatory Structures: Concepts, Relations, and Representation Hemalata IyerErgonBuch1995 Subject analysis and indexingTheoretical foundation and practical adviceRobert FugmannErgonSoftcover1993