HJERPPE, Roland. A framework for characterizing systems for knowledge organization: a first basis for comparisons and evaluation. In: Tools for knowledge organization and the human interface: Proceedings: 1st International ISKO Conference, Darmstadt, 14-17 August 1990. Organized by the International Society for Knowledge Organization (ISKO). Ed. by Robert FUGMANN. Frankfurt/Main: INDEKS, 1990, s. 21-34. Advances in knowledge organization, vol. 1-2, ISSN 0938-5495. ISBN 3-88672-020-9 (vol. 1). ISBN 978-3-88672-020-0 (vol. 1). ISSN 3-88672-021-7 (v. 2). ISBN 978-3-88672-021-7 (v. 2).
Dostupné také digitalizovaně komerčně přes Google: http://books.google.cz/books?isbn=3886720217
Ve: NK ČR (ABA001) -- sign. T 162723; NTK (ABA0013) - sign. A 27254