Definice termínu ve Slovníku typů SOZ (KOS Types Vocabulary, http://wiki.dublincore.org/index.php/NKOS_Vocabularies#KOS_Types_Vocabulary): http://w3id.org/nkos/nkostype#pick_list.
http://aleph.nkp.cz/F/?func=direct&doc_number=000001191&local_base=KTD