1
A. Welsh and S. Batley, Practical cataloguing: AACR, RDA and MARC 21, Facet, London, 2012.
2
Classification Web, https://classificationweb.net/.
3
Library of Congress Authorities, https://authorities.loc.gov/.
4
MARC 21 Format for Authority Data, https://www.loc.gov/marc/authority/.
5
MARC 21 Format for Bibliographic Data, https://www.loc.gov/marc/bibliographic/.
6
OCLC Classify, http://classify.oclc.org/classify2/.
7
RDA Toolkit, https://access.rdatoolkit.org/.
8
WebDewey, http://dewey.org/webdewey/login/login.html;jsessionid=3500A29A629DAAFA954D38118ADFEA65.
9
A. Welsh, 2017.
10
G. Grim, Catalogue and Index.
11
J. Howard, Catalogue and Index.
12
S. Maule, Catalogue and Index, 2011, 162.
13
C. Middleton, Catalogue and Index.
14
A. Riddick, Catalogue and Index.
15
A. Welsh, Catalogue and Index.
16
A. Welsh, Catalogue and Index.