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<referencetext xmlns="http://eprints.org/ep2/data/2.0">[1] IFLA Section on Classification and Indexing, Working group on principles underlying subject heading languages. Principles underlying subject heading languages (SHLS), editors Maria Inês Lopes and Julianne Beall. München: Saur, 1999.
 
[2] Elisabeth Freyre - Max Naudi. MACS: Subject access across languages and networks. In: Subject retrieval in a networked environment: papers presented at an IFLA satellite meeting sponsored by IFLA Section on classification and indexing &amp; IFLA Section on information technology, OCLC, Dublin, OHIO, USA, 14-16 August 2001. Dublin (OH): OCLC, 2001.</referencetext>
