Odkazy a literatúra 1
INSPEC Classification http://www.iee.org.uk/publish/inspec/docs/classif.html
BLISS Classification http://www.sid.cam.ac.uk/bca/bcahome.htm
TAYLOR, Arlene. Introduction to cataloguing and classification. 8. vyd. Englewood : Libraries Unilimited, Inc. 1992. ISBN 0-87287-811-2 (kapitola 20. Other Classification Systems)