APA

Klar R., Opitz O., . (1997). Classification and knowledge organization: proceedings of the 20th annual conference of the Gesellschaft fºr Klassification e. V., University of Freiburg, March 6-8, 1996. Berlin: Springer-Verlag.

Chicago

Klar Rºdiger, Opitz Otto, . 1997. Classification and knowledge organization: proceedings of the 20th annual conference of the Gesellschaft fºr Klassification e. V., University of Freiburg, March 6-8, 1996. Berlin: Springer-Verlag.

Harvard

Klar R., Opitz O., . (1997). Classification and knowledge organization: proceedings of the 20th annual conference of the Gesellschaft fºr Klassification e. V., University of Freiburg, March 6-8, 1996. Berlin: Springer-Verlag.

MLA

Klar Rºdiger, Opitz Otto, . Classification and knowledge organization: proceedings of the 20th annual conference of the Gesellschaft fºr Klassification e. V., University of Freiburg, March 6-8, 1996. Berlin: Springer-Verlag. 1997.